HELICINID A. 255 
margin forming with the columella an angle of about 90°. 
Operculum thin, horn-coloured. Height 23, greatest breadth 4, 
least br. 34 mill. 
Helicina laciniosa, Mighels, in Proc. Bost. Soc. 1845, p. 19; Gould, 
Exped. Shell, 1851, p. 99, f. 108; Pfr. Pneum. Mon. p. 352. 
Hab. Oahu, Sandwich Islands. 
31. HeLicINA VESTITA. > B. M. 
Shell globose, thin, concentrically ribbed, small; aperture semi- 
lunar; outer lip thin (Sow.). Height and breadth about 
2 mill. 
Helicina vestita, Gilding, in Sow. Thes. n. 71, p. 14, t. 1, f£. 42; 
Pfr. Pneum. Mon. p. 353. 
Hab. North America. 
32, HeLICINA MARGARITACEA. 
Shell globular, glassy, fragile, yellowish-whitish, very pellucid ; 
spire moderately convex ; aperture semicircular; peristome very 
thin, simple, with the columellar margin rather impressed. 
Height 13, breadth 2'”. (Lesson.) 
Helicina margaritacea, Lesson, Voy. de la Coquille, p. 350; Pfr. 
Preum. Mon. p. 353. 
Hab. New Guinea. 
33. HELICINA EXIGUA. 
Shell extremely minute, conic, thin, very faintly punctulated 
and striated, pellucid, pale horn-coloured; spire conic, rather 
obtuse; whorls 5, very convex, last obsoletely angulated, nearly 
flat beneath; aperture oblique, lunate; columella shortly re 
ceding, dilated into a small callus; peristome simple, thin. 
Height 2, breadth 24 mill. 
Helicina exigua, Pfr. in Proc. Z. S. 1848, p. 121; Pnewm. Mon. 
p. 353 
Hab. Honduras (Dyson). 
34, HEeLIcINA MULTICOLOR. 
Shell small, rather solid, conic-globose, striated very minutely, 
lemon-yellow, banded sometimes with fuscous, or uniformly 
fuscous-reddish, convex beneath; spire with four moderately- 
convex whorls, last whorl rounded on the periphery; suture 
impressed; aperture lunate, broad; peristome simple, sharp, 
obtusely angulated at the base; columella dilated into a large 
callus. Height ~,, breadth ; inch. (Gowld.) 
