258 CATALOGUE OF PHANEROPNEUMONA. 
A variety occurs with the spire somewhat raised, conoidal. 
40, HELICINA CORNEA. 
Shell very similar to that of H. orbiculata (Sow.), thicker and 
darker, rather less depressed, with the columella and the lower 
part of the inner lp callous, and the outer lip very slightly 
notched behind the columella (Sow). Height about 3, breadth 
about 4 mill. 
Helicina cornea, Sow. Thes. n. 66, p. 13, t. 1, f. 35, 36; Pfr. 
Pneum. Mon. p. 356. 
Locality unknown. 
41. HELICINA ROTUNDA. 
Shell subglobose, rounded, thick, smooth, rose-coloured ; spire in- 
flated, with the apex acuminated ; whorls 6, very little convex ; 
aperture narrow, semilunate; labrum thin, slightly reflexed; 
columella thickened, callous, with a distant triangular im- 
pression on the centre; columellar angle of the aperture emar- 
ginated, sinuous. Length 7, breadth 8 mill. (Or0.) 
Helicina rotunda, Orb. Moll. Cub. i. p, 252, t. 21, f. 1-8; Sow. Thes.. 
n. 69, p. 13, t. 3, f. 111; Pneum. Mon. p. 357. 
Hab. Cuba (Sagra). 
42. HEeLIcINA RUSTICA. 
Shell conoidally-depressed, thin, obliquely and slightly ribbed, 
pale horn-coloured; spire shortly conoidal, rather blunt ; 
whorls 33, moderately convex, last depressed, not descending 
anteriorly, nearly flat beneath; aperture very oblique, broadly 
semiovate; columella short, perpendicular, simple, dilated back- 
ward into a circumscript glassy callus; peristome simple, 
straight, with the basal margin almost rectilinear. Height 2, 
greatest breadth 32, least br. 3 mill. 
Helicina pallida, Pfr. in Z. f. M. 1848, p. 86. (Not Gould.) 
Helicina rustica, Pfr. Jc. n. 25, p. 26, t. 9, f. 26-29; Pnewm. Mon. 
p. 357. 
Hab. Tahiti. 
43. HELICINA INCONSPICUA. 
Shell minute, depressed-conoidal, thin, scarcely shining, smooth, 
fuscous; spire very shortly conoidal, rather blunt; whorls 33, 
scarcely convex, last somewhat depressed, rounded, not de- 
scending anteriorly, slightly convex beneath; aperture oblique, 
semiovate; columella receding, sending off from its base an 
impressed arcuated line, which surrounds the whitish, inflated 
