Key to Species.
|1. Whorls cancellated.|
|a. Spire as long as the body-whorl, about 15 ribs on the last whorl||M. ula.|
|b. Spire longer than the body-whorl, about 11 ribs on the last whorl||M. dictyota.|
|2. Whorls not cancellated, longitudinal ribs predominant.|
|a. Spire about the length of the body-whorl, about 18 straight ribs on the body-whorl||M. subaustralis.|
|b. Spire longer than the body-whorl.|
|aa. Ribs continuous over the whorls, about 10 on the last whorl, with spiral rows of red dots||M. goodingi.|
|bb. Shell minute, about 16 flexuous ribs on the last whorl||M. flexicostata.|
Mangilia goodingi, E. A. Smith.
Smith, Ann. Mag. Nat. Hist. (5), vol. xiv., p. 320 (1884).
Shell acuminately ovate, turriculate, white, ornamented with series of red dots on the ribs, one above the periphery, another near the base of the whorls; there are 7 volutions, the first two convex, the following slightly shouldered, almost flat; ribs continuous; 9 to 10 prominent plicate ribs on the last whorl, continuing to its base; the whole shell with minute close spiral striæ; the body-whorl with a third series of red dots towards the base. Aperture narrow, less than half the length of the shell; outer lip thickened, slightly sinuated; canal narrow, short.
Length, 7.5 mm.; breadth, 2.7 mm.
Type in the British Museum (Nat. Hist.).
Hob. New Zealand. Foveaux Strait (A. Hamilton).
The five prominent plicate ribs, which in the single specimen before me are continuous up the spire, and the spiral row of reddish, dots on the ribs, two on the upper whorls and three on the last, are the principal distinctive characters of this very elegant species (E. A. S.).
Mangilia ula, Watson.
Watson, Journ. Linn. Soc. London, vol. xv., p. 420 (1881); “Challenger” Exp. Rep., pt. 42, vol. xv., p. 312, pl. xxii., fig. 1 (1886).
Shell rather short, fusiform, biconical, scalar, angulated, obsoletely ribbed and with rather strong spiral threads. Snout rather short, broadish and lop-sided. In the shoulder a shallow, open, rounded sinus.
Length, 6 mm.; breadth, 3mm. Aperture: Length, 3 mm.; breadth, 1.5 mm.
Type in the British Museum (Nat. Hist.).
Hob. In 700 fathoms, off East Cape (Stat. 169, Chall. Exp.); one specimen. Obtained at no other locality.
Mangilia dictyota, Hutton.
Hutton, Trans. N.Z. Inst., vol. xvii., p. 316, pl. xviii., fig. 8 (1885); Pliocene Moll, of N.Z., Macleay Mem. Vol., p. 53, pl. vii., fig. 37 (1893).
Shell minute, elongato-fusiform, the whorls slightly angled and cancellated. Longitudinal ribs narrow and distant, about 11 in a whorl. Spire-whorls with 3 strong distant spiral ribs, the interstices finely spirally striated; body-whorl with about 9 spiral ribs, the posterior three larger and alternating with a small rib as well as the spiral striæ. Aperture oval, nearly half the length of the shell; posterior sinus broad and shallow; anterior canal moderate.
Length, 6 mm.; breadth, 3 mm.
Described from a fossil shell of the Pliocene.
Colour of shell white, sometimes light-brown. In some specimens a brown band appears on the base of the penultimate whorl, and is continued on the body-whorl. Columellar lip mostly dark-violet or brown, especially the lower part of it. The spiral sculpture is variable in its conspicuity. Animal unknown.
Type in the Canterbury Museum.
Hab. Auckland Harbour (H. S.). Lyall Bay (A. Hamilton). Foveaux Strait. Chatham Islands.
This species is no doubt nearly allied to M. connectens, Sow., and M. cuspis, Sow., from South Australia.
Mangilia subaustralis, n. sp. Plate III., figs. 2, 2a.
Shell fusiform, white, spire as long as the body-whorl. Whorls 6 ½, shouldered, longitudinally plicate and spirally striate; the plicæ, about 18 on the last whorl, are smooth, between them equidistant cinguli, which are much closer together from below the upper suture to the keel. Suture impressed, submargined. Protoconch consisting of two minute acute and smooth whorls. Aperture elongately oval, angled above; outer lip thin, sharp, sinuated, with a shallow posterior sinus near the suture, above the keel; columella slightly concave, with a very thin callus; canal short, straight. Animal unknown.
Length, 11.5 mm.; breadth, 4.5 mm.; height of aperture, 6 mm.
Type in my collection.
Hab. New Zealand; exact locality unknown. One specimen only.
This shell is very closely allied to M. australis, Ad. and Aug., from Australia and Tasmania, which, however, is usually larger; the whorls are but indistinctly shouldered, the aperture not angled above, and the anterior canal broader.
Mangilia flexicostata, n. sp. Plate III., figs. 3, 3a.
Shell minute, oval-elongated, spire longer than the body-whorl, white, semi-transparent. Whorls 5, narrowly shouldered, with flexuous plicæ, about 16 on the last whorl, microscopically spirally striate. Protoconch 1 ½ whorls, smooth, minute. Suture deep. Aperture oval, angled above, outer lip somewhat thickened, sinuous, with ax broad shallow sinus just below the suture. Columella arcuate, slightly callous; anterior canal short, rather oblique, truncated. Animal unknown.
Length, 2.25 mm.; breadth, 1.25 mm.
Type in my collection:
Hob. Foveaux Strait (A. Hamilton).