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Genotype: Goniscala diurna n. sp. L. Miocene, N.Z.
Shell small, turriculate, imperforate. Protoconch, styliform, of about 5 whorls bearing very faint, sigmoid axial ribs, about 20 per whorl. Whorls angled, high on early whorls, but on later ones near middle. Basal disc present. Sculpture of spaced, uniformly strong, smoothly rounded, axial ribs, crossed by distant spiral cords. Base with spirals but no axials. Basal bourrelet, scarcely, if at all, developed.
Of the subdivisions presented by Cossmann, Goniscala has most in common with Punctiscala, at all events with the species foresti de Boury (Cossm. 1912, pl. 4, figs. 3, 4). This, however, is not the genotype. Both foresti and diurna have a styliform protoeonch, angulate whorls, uniform axials without varices and a basal disc without axials. Punctiscala of course, is characterized by spiral punctae, but since these are altogether absent from the New Zealand fossil, that genus is unsatisfactory. Other groups classed near Punctiscala, but without punctae, such as Funiscala and Torquatiscala are of a different shape.
Goniscala diurna n.sp. Plate 26, fig. 9.
Protoconch with whorls gently convex, increasing very slowly, considerably narrower than the first neanie whorl. Sculpture of 12 axials per whorl, corresponding on each, but with about one-quarter whorl twist for the whole 12 whorls Spire whorls with three distant
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spiral cords, the highest following the angle, all rather weaker across the axials. Base with three spaced spirals.
Height, 8·6 mm.; diameter, 2 mm.
Locality, G.S. 2222. Siltstone, Allday Bay (Awamoan).
Cirsotrema angulata Marw. is superficially similar, but it has the basal axials and bourrelet of Cirsotrema.
Pyrgiscilla festiva n.sp. Plate 26, figs. 17, 18, 19; plate 27, fig. 32.
Shell of relatively moderate size. Protoconch paucispiral bulbous, with large nucleus, partly immersed by the first axial ribs which ascend on the nucleus considerably higher than does the last part of protoconch. Whorls at first cylindrical, turretted, later less impacted and having slightly concave sides; base rather quickly contracted. Sculpture of about 15 strong axials per whorl with somewhat wider interspaces abruptly limited just above suture line; interspaces and base bearing rather weak spirals.
Height, 6·8 mm.; diameter, 1·8 mm.
Locality: G.S. 2222. Siltstone, Allday Bay (Awamoan).
This species is probably on the line of P. chattonensis (Marw.), but is distinguished by its higher, slightly concave and more staged whorls, and the less rounded periphery.
Waikura davidi n.sp. Plate 27, fig. 28.
Protoconch with about one whorl exposed, having rather globose, immersed nucleus tilted at about 30°. Sculpture of strong, rounded ribs, curving forward to suture above and extending equally strongly to lower suture, but dying out just below basal periphery.
Height, 3·5 mm.; diameter, 1·5 mm.
Locality: G.S. 2222, Siltstone, Allday Bay (Awamoan).
W. davidi differs from the other species of Waikura except hawera Laws in having the ribs persist strongly to the lower suture. From hawera the new species is easily distinguished by the different shape and by the bending forward of the ribs to form a subsutural border.
Macrozafra formosa n.sp. Plate 26, fig. 8.
Shell small, broadly subulate fusiform; spire whorls flattened, to slightly concave, but bulging above suture. Body flattened above sub-angled periphery, base contracting rapidly to short, straight neck. Protoconch damaged but as far as can be seen like M. subabnormis. Sculpture of about 13 axial ribs per whorl; these extend from suture to suture, and each is drawn up to low, rounded tubercle at periphery, which is very low on whorl. Ribs low, rounded, and separated by somewhat wider concave interspaces. Only faint suggestions of spirals present on spire whorls and body, but neck bearing about 7 rounded spirals with linear interstices. Columella straight above, bending gradually to canal without a fold.
Height, 6 mm.; diameter, 2·5 mm.
Locality: G.S. 2222. Siltstone, Allday Bay (Awamoan).
This shell is not a strict Macrozafra, but it can remain with that group until more is known of its affinities.