AMPHISPHYRA. 521 



A. HYALTNA, TllVtOll. 



Plate CXIV. D. fig. 1, 2, and (Animal), Plate U. U. fig. 2. 



Bulla hyalina, Turt. (not of Gmelin, which is merely from Martini Conch. 

 Cab. vol. i. f. 199), Mag. Nat. Hist. (Loudon's), vol. vii. 

 p. 353. — Brit. Marine Conch, p. 141. — Thompson, Ann, Nat. 

 vol. XV. p. 314. 

 Diapliana pellucida, Johnston, Berwick. Club, vol. ii. p. 32. 



„ Candida, Johnston, Berwick. Club, vol. ii. p. 32, fry, probably. 

 Bulla minuta, Macg. Moll. Aberd. p. 334, copied, Brit. Marine Conch, p. 252, 



fry, teste Jeffreys, from type. 

 Utriculus minutus. Brown, lUust. Conch. G. B. p. 58, pi. 1 9, f. 7, 8, fry. 



„ candidus, Brown, Illust. Conch. G. B. p. 59, pi. 19, f. 13, 14, young. 

 „ hyalinus. Brown, Illust. Conch. G. B. p. 59. 

 „ pellucidus. Brown, Illust. Conch. G. B. p. 59, pi. 19, f. 10, 11. 

 AmpMsphyra pdbicida, Loven, Index Moll. Scandin. from type. 



„ hyalina, Alder, Cat. Moll. Northumb. and Durh. p. 28. 



Bulla {Utriculus) pellucida, A. Adams, Sowerby, Thesaur. Conch, vol. ii. p. 571, 

 pi. 120, f. 21. 



This minute and very fragile shell is thin and semi- 

 transparent, smooth or nearly so, of a pure and glossy 

 white, and of an oblique broadly oval figure, that is sub- 

 truncated posteriorly, and is well rounded at the anterior 

 extremity. It is composed of from three to four volutions 

 (usually the former number only), of which the body, 

 which is inflated, although often a little flattened near the 

 suture, and at times subretuse in the middle, is somewhat 

 rounded below. The crovt'n is nearly truncated ; but the 

 mamillary apex almost always projects a little above it, 

 though the whorls of the sj^ire, which are extremely short, 

 rather broadly and in general retusely flat-topped, and 

 very distinctly pronounced owing to that circumstance and 

 the abrupt perpendicularity of their rise, are usually more 

 or less sunken. The mouth is capacious, becoming so 

 quickly dilated anteriorly, as to fill nearly one half of 

 the ventral area : above, it is almost (yet not quite) on a 



VOL. HI. 8 X 



