326 MOLLUSC A. TROCHUSIDiE. Ianthina. 



4. S. canalicidatum Convex, ornamented on both sides, with granulated 



unequal lines ; edge prominent, crenated ; pillar-cavity furrowed and crenated 

 within ; aperture round. — Sower. Min. Conch, t. Dxxiv. £ 1 — London Clay. 



5. S. plicatum. Convex, wrinkled, concentrically sulcated ; pillar-cavity 

 bounded by a more or less projecting crenated ridge. Soever. Min. Conch, 

 t. Dcxxiv. f. 2. London Clay. 



Gen. LXI. IANTHINA. — Aperture triangular, pillar-lip 

 straight, body-lip slightly convex and oblique. Foot with 

 a buoyant spongy body. 



290. I. communis. — Purple, striated transversely by the lines 

 of growth ; obsoletely striated spirally. 



Cochlea marina Ianthina, List. Conch, t. olxxii. f. 24 — Helix Ian. Linn. 

 SySt. i. 1246. Turt. Conch. Diet. 58 — On the Irish coasts, not un- 

 common ; rare in England. 

 Breadth and height about half an inch ; fragile ; whorls four, apex obtuse, 

 the body-whorl subcarinated ; outei-lip thin, pillar-lip a little reflected. 

 When the animal is irritated, a purple fluid is ejected from the cellular mar- 

 gin of the cloak above the gilis This species was added to our Fauna by 



the late Miss Hutchins, in consequence of recent specimens which occurred to 

 her in Bantry Bay. It has since been found at several places on the coast of 

 Ireland and west of England. 



Gen. LXII. VELUTINA.— Aperture circumscribed, no pil- 

 lar, body-lip oblique ; foot simple. 



291. V. Icevigata. — Whorls three, transversely wrinkled, 

 striated spirally. 



Helix laevigata, Linn. Syst. i. 1250. — Bulla velutina, Mnll. Zool. Dan. 



t. ci. f. 1, 4 Helix haliotoides. Fab. Faun. Groen. 390 — Helix Isev. 



Don. Brit. Shells, t. cv. 3foni. Test. Brit. 382. — In deep water, not rare. 

 Length /gths, breadth i%ths of an inch ; cuticle brown, rough, with regu- 

 lar equidistant spiral ridges ; two first wliorls minvite, rounded ; the bod_v- 

 whorl ventricose ; aperture patulous, outer-lip thin, body -lip a little thick- 

 ened, and slightly reflected ; the inside of the aperture is frequently tinged 

 with purple. 



292. V. Otis. — Whorls three, smooth, transversely oblong. 



Helix apertura patentissima, Walk. Test. Min. t. i. f. 17- — Helix Otis, 

 Turton, Conch. Diet. p. 70 Interstices of rocks covered at high wa- 

 ter, Devonshire. 

 Length and breadth about a line ; semitransparent, glossy ; aperture 

 transversely oblong ; body-lip a little thickened and flatfish. 



293. V. stylifcra. — Whorls five, smooth, longitudinally ob- 

 long. 



Phasianella styl. Turton, Zool Journ. No. 7- 367- t. xiii. f. 11 — At Tor- 

 bay, attached to the spines of Echinus esculentus. 

 Length one line, breadth not so much ; yellowish horn -coloured, transpa- 

 rent ; the body -whorl very large, the otliers forming a short pointed spii-e ; 

 aperture suborbicular, the margin thin and incomplete on the body retrally. 



