Go to National Library of New Zealand Te Puna Mātauranga o Aotearoa
Volume 45, 1912
This text is also available in PDF
(1 MB) Opens in new window
– 294 –

Art. XXXV.—New Species of Tertiary Mollusca.

[Read before the Philosophical Institute of Canterbury, 4th December, 1912.] Plates XII-XIV.

Dr. P. Marshall and Mr. R. Speight sent me a number of New Zealand Tertiary fossils they had been collecting for examination, and amongst them I found a number of species I consider to be new to science, and the most important ones are described hereafter. Of quite especial interest is the occurrence of the subgenus Perrona in a form very nearly allied to a species of the Pliocene of French India.

I am much obliged to the two gentlemen for bearing the cost of photographing the type specimens.

Polinices ambiguus sp. nov.

Shell small, rotundly ovate, with spiral lines, umbilicus covered up in the adult, suture impressed. Sculpture consisting of inequidistant fine spiral cords, fine microscopic lines in the interspaces, crossed by oblique flexuous growth-lines. Spire broadly conoidal, about one-third the height of the aperture. Protoconch of one papillary whorl. Whorls 5, first slowly increasing, but the last rather large; they are convex, the body-whorl slightly flattened below the suture, base narrowed. Suture deep, but not canaliculate. Aperture oblique, narrowly ovate, slightly effuse below. Outer lip thin and sharp, convex; the basal lip narrowly rounded. Columella short, arcuate. Inner lip rather broad, not very callous, with a distinct pad below the suture; umbilicus slightly open in young specimens, but completely closed up in adult shells.

Picture icon

Polinices ambiguus; × 3½

Height, 13 mm.; diameter, 10.5 mm. (holotype).

Holotype and 2 paratypes in the Canterbury Museum, Christchurch.

Locality.—Hundalee, Amuri Bluff (R. Speight). Pliocene.

Remark.—The spiral ornamentation and deep suture approach this species to P. suturalis Hutton.

Clavatula (Perrona) neozelanica sp. nov. Plate XII, fig. 3.

Shell rather large, fusiform, imperforate, with scalar spire, narrowly excavated shoulder, spirally lirate, with a somewhat shallow, broadly rounded labial sinus on the shoulder and extending over the keel. Sculpture of narrow spiral cords, flattish, separated by linear interstices, getting broader and more conspicuous upon the base; they are crossed by oblique fine growthlines. Spire conical, gradate, of the same height as the aperture without canal; angle 45°. Protoconch obtuse, slightly tilted. Whorls 6½, the last large and somewhat ventricose, with a rounded keel, narrow and concave shoulder above it, straight, flat below; the body-whorl flatly convex, contracted below. Suture well impressed, submargined below by a rather broad and but little raised convex band. Aperture vertical, pyriform, channelled above, produced below into a short canal, its base notched. Outer lip thin and sharp, with a sinus above. Columella vertical and almost straight, turned to the left towards the canal. Inner lip thin and narrow; an elevated rib descending towards the right side of the canal, and inside it is the distinct siphonal fasciole with laminate growth-periods.

Picture icon

Fig. 1—Venericardia Ponderosa Suter.
Fig. 2—Terebra Orycta Suter
Fig. 3—Clavatula (Perrona) neozelanica Suter

Picture icon

Fig. 1.
Fig. 2.

– 295 –

Height, 60 mm.; diameter, 25 mm. (holotype).

Holotype in the Canterbury Museum, Christchurch.

Locality.—Lower gorge of Waipara, lower horizon (R. Speight). Miocene.

Remarks.—This is the first species of Clavatula recorded from New Zealand. It is very nearly allied to C. (Perrona) unisulcata Cossman, from the Pliocene of Karikal, French India, and, less so, to C. (Perrona) semimarginata Lamarck, from the Miocene of Bordeaux, France.

Terebra orycta sp. nov. Plate XII, fig. 2.

Shell fairly large, subulate, the whorls swollen below the suture, thence slightly excavated, with faint indications of axial plications. Sculpture consisting of 18 to 20 axial plications, and there seems to be no spiral ornamentation; all the specimens are in such a bad state of preservation that it is impossible to ascertain the sculpture with certainty. Spire high, subulate; angle about 20°. Protoconch lost in all specimens. Whorls about 10 to 12, somewhat swollen below the suture, straight or slightly concave to the suture below; base contracted. Suture not much impressed. Aperture vertical, subrhomboidal, with a short, open canal below, its base notched. Outer lip thin, sharp, somewhat contracted at the middle. Columella vertical, straight, bent to the left below towards the canal. Inner lip narrow, thin, with a rib issuing underneath it and descending to the base of the canal, leaving a lamellate siphonal fasciole between it and the margin of the canal.

Height, 47 mm.; diameter, 12 mm. (holotype, imperfect):

Holotype and 5 paratypes in the Canterbury Museum, Christchurch.

Locality.—Lower gorge of Waipara, lower horizon (R. Speight). Miocene.

Remark.—This species is no doubt nearly allied to the South Australian T. angulata Tate, and also, though more distantly, to T. biplex Hutton.

Pecten (Patinopecten) marshalli sp. nov. Plate XIII, figs. 1 and 2.

Shell large, inequivalve, subinequilateral, slightly oblique, ears large, the right valve with dichotomous scaly radial ribs, the left valve with distant, broadly rounded radial ribs, slightly more inflated than the right valve. Beaks small, approximate. Ears large, subequal, the anterior somewhat larger, on the right valve with a byssa notch and ctenolium. Anterior end slightly shorter, roundly angled above the middle, dorsal margin concave, descending, margin regularly arched below the angle. Posterior end narrowly convex at the middle, broadly rounded towards the convex basal margin, dorsal margin straight, descending. Sculpture: Right valve having on the anterior ear 2 to 3 strong radial ribs and close, lamellar, sinuous, concentric striae, the posterior ear with inconspicuous radial ribs, rendered scaly by the irregular concentric striae; disc with about 11 dichotomous, narrow, rounded, scaly radial ribs, the division of the ribs beginning at the umbo, occasionally some ribs are trichotomous, and the width of the ribs is very variable; the interstices between the ribs are mostly of the same

– 296 –

width as the ribs; the whole surface ornamented with distant concentric striae, imbricating the ribs. Left valve with subequal triangular ears, the anterior ear with fine radial riblets crossed by distant laminar concentric striae; the posterior ear without distinct radial riblets, but rather distant lamellar concentric striation; disc with 11 subequidistant, high, rounded radial ribs, the 3 posterior interstices with a low, broadly rounded rib in the centre, bringing the total number of ribs up to 14; the whole surface with fine, dense concentric striation. Margins smooth inside. Hinge-plate solid, with a large, oblique, triangular resilifer, directed forwards. Adductorscar very large, rounded, slightly longer than high, vertically striated, situation central or slightly posterior.

Right valve: Height, 115 mm.; length, 120 mm.; diameter, 20 mm. (holotype).

Left valve: Height, 107 mm.; length, 108 mm.; diameter, 25 mm. (holotype).

Holotypes in the collection of Dr. P. Marshall, Otago University, Dunedin.

Locality.—Muddy Terrace, Waikaia (Dr. P. Marshall). Miocene.

Remarks.—the upper part of a right valve from limestone on coast, ten miles north of Raglan (loc. 97), is in the Museum of the Geological Survey, Wellington. This specimen has the anterior ear in perfect condition.

Venericardia ponderosa sp. nov. Plate XII, fig. 1.

Shell large and solid, rounded trigonal, inequilateral, the umbo near the anterior end, with flatly rounded, nearly smooth radial ribs, the anterior ones narrow and scaly, the posterior ribs inconspicuous, concentric striation prevailing. Beak very near the anterior end, large, inflated, incurved, prosogyrate. Anterior end very short, flatly convex, the margin rounded, dorsally deeply excavated. Posterior end very long, moderately ventricose, broadly rounded, the dorsal margin almost straight and long, slowly descending; basal margin broadly convex. Lunule small, cordate. Escutcheon linear. Sculpture consisting of 25 conspicuous radial ribs, to which about 5 inconspicuous posterior ribs have to be added; the 6 anterior ribs are narrow, rounded, scaly, the interstices broader than the ribs; the median ribs of the valve are broadly convex, stout, crossed by fine concentric growth-lines, the interstices very narrow; on the posterior end of the valve the ribs are flattish, low, inconspicuous, lamellar concentric striation predominating. Margins distinctly plicated, thick. Hinge-plate broad and heavy, left valve with 2 cardinal teeth, the anterior tooth short and thick, blunt, oblique, the posterior tooth long, nearly horizontal, arched, finely transversely striated. Ligament rather long, external. Adductor-scars unequal, large, deep, the anterior elongately oval, the posterior rounded subtrigonal.

Left valve: Height, 80 mm.; length, 100 mm.; diameter, 38 mm. (holotype).

Holotype in the collection of Dr. P. Marshall, Otago University, Dunedin.

Locality.—Muddy Terrace, Walkaia (Dr. P. Marshall). Miocene.

Chione (Lirophora) speighti sp. nov. Plate XIV, figs. 1 and 2.

Shell rather large, ovate, subpentagonal, flatly convex, inequilateral, with submedian and posterior angle, with distant concentric lamellae, and a submedian and posterior ridge, angulating the concentric lamellae. Beaks approximate, very little raised, incurved and directed forwards, with an

Picture icon

Fig. 1.
Fig. 2. Chione (Lirophora) speighti Suter.

– 297 –

anterior and posterior angle. Anterior end short, not quite one-fifth of the total length, convex, the dorsal margin descending, concave; posterior end very distinctly truncated, the dorsal margin convex; basal margin broadly convex, with an angle behind the middle and on meeting the posterior truncation. Lunule narrow and long. Escutcheon depressed, long and narrow. Sculpture consisting of distant (about 10 on adult shells), thin, erect, inequidistant concentric laminae, sharply raised posteriorly and at the intersection of the submedian and posterior ridge; interspaces with fine growth-lines and traces of fine radiate striae. Margins finely crenulate. Left valve with a subvertical, long and narrow cardinal; the median tooth stout, triangular, bifid; the posterior cardinal nearly horizontal, long and thin.

Length, 61 mm.; height, 54 mm.; diameter, 12 mm. (x 2) (holotype).

Holotypes (2) and paratypes (5) in the Canterbury Museum, Christchurch.

Locality.—Lower gorge of Waipara, lower horizon (R. Speight). Miocene.

Remarks.—This species is very nearly allied to the Pliocene and Recent Chione yatei Gray. Small specimens of C. speighti are also in the collection of the Geological Survey, from the Miocene of the lower part of the Pareora River (Enys coll.); loc. 458. C. yatei is most likely the descendant of C. speighti. The species is named in honour of Mr. R. Speight, Geologist at the Canterbury Museum.