434 



HELICID^. 



Fig. 692. 



cone ; whorls five, rather convex, the last scarcely equalling two 

 fifths the shell's length, ascending above, somewhat nar- 

 rowed towards the base ; columella deeply sub-plicate, 

 parietal wall of the aperture furnished with one tooth- 

 like callus ; aperture vertical, sub-scmi-circular ; peris- 

 tome thin, scarcely expanded, its right termination quite 

 V, ^ arched. Length two and three foiu'ths, diameter one 

 [J^/ millimetres. 



Inhabits Greenland, and has also been found at Anti- 

 costi Island. 



The description given above is translated from Pfeififer. The 

 specimen figured, which I refer to this species, has another denticle 

 on the columella, and a lamina-like process within the aperture at 

 the base of the last whorl. 



p. Hoppii. 



Pupa pentodon. 



Fig. 120. 



Shell elongated-ovate, obtuse at apex, smooth ; whorls five ; aperture sub-tri- 

 angular, armed with nine teeth, the two largest of which are curved; lip white, 

 broadly everted ; umbilicated. 



Vvrtifjo pentodon, Say, Journ. Acad. Nat. Sc. ii. .376 (1822) ; eil. Binnev, 27. 



Pupa pentodon, Gould, Best. Journ. Nat. Hist. iv. 353, pi. 16, figs. 10, U (1843). — Db 



Kay, N. Y. Moll. 50, pi. 4, fig. 48 ; pi. 35, fig. 337 (1843). — Pfeiffkr, Men. Hel. 



Viv. ii. 359 ; in Chemn. ed. 2, 125, pi. 16, figs. 24-26. — Binney, Terr. Moll. ii. 



328, pi. 12, fig. 1. — W. G. Binney, Terr. Moll. iv. 143. 

 Pupa citrvidem, Gould, Inv. 189, fig. 120 (1841). 

 Pupa Tappaniana, Adams, Sillim. Journ. fl] xl. 8nppl. ; Vermont Shells, 158 (1842). — 



Pfeiffer, Symbolaj, ii. 55. 

 Ij'ncochila pentodon, Mou.SE, Journ. Portl. Soc. i. 36, fig. 85 ; pi. 10, fig. 86 (ISCt) ; Am. 



Nat. i. 667, fig. 56 (1868). 



Shell minute, ovate, but much elongated ; of a spermaceti-white 

 color ; whorls five, convex, smooth, gradually diminishing to an 

 obtuse apex ; suture deeply impressed ; aperture sub-tri- 

 angular, wdth the front and outer angles rounded, and 

 the outer lip curved inwards, so as almost to make the 

 aperture heart-shaped ; the transverse margin is straight, 

 and slightly oblique ; the inner lip is also nearly straight, 

 so that these two form a right angle at their junction ; lip 

 widely reflected, flattened, white ; throat armed with nine 

 teeth ; the longest, somewhat curving to the left, com- 

 pressed and pointed, is situated on the middle of the transverse lip, 

 and has a small one seated at its left side ; at the front, nearly op- 



FiK. 693. 



P. pentodon. 



