HELICINID®. 269 
wards into a small whitish callus, forming an indistinct angle 
with the peristome, which is simple and narrowly expanded. 
Height 10, greatest breadth 12, least br. 11 mill. 
Helicina zephyrina, Duclos, in Guér. Mag. 1833, t. 21; Sow. Thes. 
peo, p. Os, ted, 125,127 3 Pir. torn. 4a, py al, to4, 1 16-18 
(from Guérin), t. 7, f. 3, t. 8, f. 21; Pnewm. Mon. p. 371. 
Helicina Ambeliana, Sow. Thes. n. 38, p. 8, t. 1, f. 26. 
Helicina zephirina, Orb. Moll. Cub. i. p. 246, t. 19, f. 15, 16? 
Hab. Mexico; Cuba? (Orb. Sow.) 
75. HeLIcINA AMPLIATA. 
Shell conic, whitish (7), with a few excessively fine strive of 
growth, otherwise smooth and shining; apex subacute; spire 
much elevated, with the outlines moderately curvilinear ; 
whorls 54, a little convex, with a distinct suture; last whorl 
subangular, anteriorly subplanulate; aperture transversely 
much dilated, depressed in the upper part of the right side; 
labrum with a large thick deposit. This shell resembles 
H. Jamaicensis, Sow., but is much larger, much less globose, and 
more conic. Mean divergence about 90°; height 0.6, greatest 
breadth 0.67, least br. 0.57 inch. (Ad.) 
Helicina ampliata, Adams, Contrid. to Conch. nu. 7, p. 101; Pfr. 
Pneum. Mon. p. 371. 
Hab. Jamaica. 
76. HELICINA TENUIS. 
Shell turbinate, extremely thin, scarcely striated, pellucid, horn- 
coloured-whitish, painted with three indistinct red bands; spire 
conic, pointed; whorls 6, scarcely convex, last not descending 
anteriorly, rather flat beneath; aperture nearly perpendicular, 
semiovate, somewhat triangular; columella short, terminating 
backwards in a slight tooth, dilated above into a_ white, 
shining, circumscript callus; peristome thin, spreading an- 
gularly, basal margin forming an angle with the columella. 
Height 82, greatest breadth 11, least br. 9 mill. 
Helicina tenuis, Pfr. in Proc. Z. S. 1848, p. 124; le. n. 47, p. 40, 
t. 7, f. 33, 34; Pneum. Mon. p. 372. 
8. Yellowish-white, with a single very narrow band on the middle 
of the last whorl, which is composed of yellow dots. 
Hab. Yucatan; the variety from Mexico. 
77. HELICINA VERNALIS. 
Shell globose-conic, thin, scarcely striated, granulated under a 
lens, shining, pellucid, lemon-yellow or whitish or rose-fulvous, 
AA 2 
