HELICINIDA. Q75 
slightly angulated, more convex beneath; aperture scarcely 
oblique, broadly semiovate ; columella short, arcuate, truncated 
at its lower extremity, forming an angle with the peristome, 
which is simple and narrowly expanded. Operculum shelly 
externally, purplish internally, with an elevated white rib. 
Height 10, greatest breadth 16, least br. 13 mill. 
Helicina citrina, Grateloup, in Act. Soc. Linn. Bord. xi. p. 413, 
t. 3, f.15; Pfr. Ic. n. 57, p. 45, t. 3, f. 4-9, t. 7, £1,2; Pneum. 
Mon. p. 379. 
Helicina polita, Sow. in Proc. Z. S. 1842, p.7; Thes. n. 33, p. 8, 
t. 2, f. 76-81; Reeve, Conch. Syst. t. 186, f. 9. 
8. Smaller; uniformly yellow, or with a white band along the 
suture; height 6, greatest breadth 83, least br. 7 mill. B. M. 
Hab. The Philippine Islands, Luzon, Mindanao, Zebu (H. Cuming). 
92. HELICINA SIMILIS. 
Intermediate between H. Guadaloupensis and H. polita, from 
the latter of which it differs in being lightly striated, and 
rather more angular. Height 83, breadth 135 mill. (Sow.) 
Helicina similis, Sow. in Proc. Z. S. 1842, p.8; Thes. n. 34, p. 8, 
t. 3, f. 1380; Pfr. Pneum. Mon. p. 379. 
Hab. Guadeloupe. 
93. HenicinA ANTILLARUM. 
Shell depressed, thin, faintly striated and crossed by very minute 
oblique striz, slightly pellucid, rufous, orange-coloured or 
greenish-yellow, often girdled with an articulated pale band; 
spire short, rather blunt ; whorls nearly 5, scarcely convex, en- 
larging rapidly, last depressed, moderately convex beneath ; aper- 
ture oblique, nearly semicircular; columella short, terminating 
externally in an indistinct knot, forming a very obtuse angle 
with the peristome, which is thin, expanded, whitish or fulvous ; 
basal callus thin, circumscript. Operculum violaceous-chestnut- 
coloured. Height 10, greatest breadth 16, least br. 14 mill. 
Helicina Antillarum, Sow. Thes. n. 29, p. 7, t. 2, f. 68-70; Reeve, 
Conch. Syst. t. 186, f. 15; Pfr. Ic. n. 58, p. 46, t. 3, f. 1-3; 
Pneum. Mon. p. 380. 
Hab. West Indies. 
94, HeticiIna GUADALOUPENSIS. 
Shell depressed, rather solid, obliquely striated, crossed by very 
minute concentric striz, rather opaque, flesh-coloured-yellow- 
ish ; spire slightly raised, somewhat nipple-shaped ; whorls nearly 
5, rather flat, increasing gradually, last slightly angulated, 
