826 
MOLLUSCA. TROCHUSID^. Ianthina. 
4. S. 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. f. 1. — Lond(m, Clay. 
5. S. plicatum. Convex, wrinkled, concentrically sulcated ; pillar-cavity 
bounded by a more or less projecting crenated ridge. Sower. 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. nlxxii. 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 ; outer-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 gills — This species was added to our Fauna by 
the late Miss Flutchins, 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. IcBvigata. — Whorls three, transversely wrinkled, 
striated spirally. 
Helix laevigata, Linn. Syst. i. 1250. — Bulla velutina, Mull. Zool. Dan. 
t. ci. f. 1, 4. — Helix haliotoides, Fab. Faun. Green. 390. — Helix laev. 
Don. Brit. Shells, t. cv. Mont. Test. Brit. 382. — In deep water, not rare. 
Length ^^^ths, breadth i%ths of an inch ; cuticle brown, rough, with regu- 
lar equidistant spiral ridges ; two first whorls minute, rounded ; the body- 
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 flattish. 
293. V. stylifera . — 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-Avhorl very large, the others forming a short pointed spire ; 
aperture suborbicular, the margin thin and incomplete on the body retrally. 
