250 CATALOGUE OF PHANEROPNEUMONA. 
15. Henicina occounta. 
Shell orbiculate-conoidal, striated, thick, dirty white; spire con- 
oidal, acuminated; whorls 52, rather flat, keeled, the last one 
more convex, obtusely angulated, shortly descending anteriorly ; 
aperture very oblique, entire, obtusely triangular; columella 
almost wanting, forming backwards a diffused basal callus; peri- 
stome straight, blunt, somewhat thickened internally. Height 
4+, greatest breadth 7, least br. 6} mill. 
Olygyra occulta, Say, in Transylv. Journ. of Med. iv. p. 529; 
Amer. Conch. t. 46, f. 4-6; Ed. Chenu (Bibl. Conch. iii.), p. 57, 
t. 15, f. 2, 6-8. 
Helicina occulta, Pfr. Jc. n. 12, p. 18, t. 4, f. 11,12; Pnewm. Mon. 
p- 346. 
Hab. North America. 
16. Henicina PIsuM. 
Shell conoidally-depressed, thick, solid, smooth, yellow; spire 
conoidal, moderately pointed; whorls 43, rather flat, the last 
one obliquely descending anteriorly, indistinctly angulated on 
the periphery, rather flattened beneath ; aperture oblique, nearly 
triangular; columella simple; peristome straight, blunt; basal 
callus yellow, shining. Operculum triangular, yellow. Height 
4, greatest breadth 6, least br. 5 mill. 
Helicina pisum, Philippi, in Z. f. M. 1847, p. 124; Pfr. Jc. n. 13, 
p. 19, t. 2, f. 30-82; Pneum. Mon. p. 347. 
8. Somewhat larger, marked sometimes with two minute white 
bands; peristome thickened, 
Hab. Sandwich Islands, 
17. Heticina ORBIGNYI. 
Shell depressed, rather lenticular, solid, faintly striated, scarcely 
shining, fuscous-flesh-coloured ; spire very little raised; whorls 
4i, rather flat, the last one depressed, slightly angulated, not 
descending; aperture oblique, semiovate, higher than broad; 
columella short, furnished at its base with a forward prominent 
tooth, dilated backwards into a white semicircular callus; peri- 
stome straight, somewhat thickened, not emarginated near the 
tooth of the columella. Operculum semiovate, chestnut-coloured- 
reddish. Height 4, greatest breadth 7}, least br. 6} mill. 
Helicina Orbignyi, Pfr. in Proe. Zool. Soc. 1848, p. 123; Je. n. 17, 
p. 21, t. 8, f. 30, 31; Pneum. Mon. p. 347. 
Hab. Cuba. 
