HELICINIDA. 291 
Helicina rhodostoma, Gray, in Zool. Journ. i. p. 68, t. 6, £.9; 
Désh. in Lam. Hist. viii. p. 161, n. 13; Reeve, Conch. Syst. t. 186, 
£5; Sow. Thes. n. 59, p. 12, t. 2, f. 171; Pfr. Ic. n. 81,'p. 60, 
t. 7, f. 4,5; Pneum. Mon. p. 398. 
Oligyra rhodostoma, Swains. Malacol. p. 337. 
B. Uniformly white, with the peristome of the same colour. 
Hab. Guadeloupe. 
139. HeniciInA BICOLOR. 
Shell depressed-conoidal, rather thin, sharply keeled, faintly 
striated and very minutely granulated and punctured under a 
lens, whitish, with two fuscous bands, the one above, the other 
below the keel; spire short, conoidal, pointed ; whorls 5, mode- 
rately convex, enlarging rapidly, last not descending, more 
convex beneath; columella fuscous, short, slightly arcuate, 
dilated, terminating in a spine-shaped angle, expanded back- 
wards into a fuscous, circumscript callus; aperture diagonal, 
broad, nearly triangular ; peristome dilated, flat, expanded, fus- 
cous internally, upper margin slightly sinuate, basal margin 
nearly rectilinear. Height 6, greatest breadth 113, least br. 9 
mill. 
Helicina bicolor, Pfr. in Proc. Z. 8S. 1852; Pnewm. Mon. p. 398. 
Hab. Tahiti. 
140. HenicINA ANGULATA. B. M. 
Shell somewhat depressed, rather thin, striated spirally, yellowish 
or rose-coloured ; spire conoidal, with the apex rather pointed ; 
suture slightly impressed; whorls 42, scarcely convex, last 
sharply keeled, not descending anteriorly, rather inflated be- 
neath, bordered with red externally and internally near the 
aperture; aperture slightly oblique, semiovate; columella short, 
slightly receding, terminating in a tooth-shaped angle; peri- 
stome white, spreading rectangularly, continued into the tooth 
of the columella; basal callus extremely thin. Height 6, 
greatest breadth 103, least br. 9 mill. 
Helicina angulata, Sow. Thes. n. 60, p. 12,.t. 2, f. 61, t. 3, f. 100; 
Pfr. Ic. n. 82, p. 60, t. 2, f. 14,15; Pnewm. Mon. p. 399. 
Hab. Brazils. 
141. HenicrinA CANDEANA. 
Shell depressed, smooth, with the outline rather rounded ; whorls 
angulated, strongly keeled on the periphery; outer lip ex- 
panded, reflected, slightly acuminated and lessened in the 
