HELICINIDZ. 259 
callus; peristome simple, straight. Height 2, greatest breadth 
3, least br. 25 mill. 
Helicina inconspicua, Pfr. in Z. f. M. 1848, p. 86; Jc. n. 26, p. 26, 
t. 9, f. 18-21; Pneuwm. Mon. p. 357. 
Hab. Tahiti. 
§ 6. Peristome not toothed, straight, sharp; shell depressed, keeled. 
44. HELICINA ZONATA, 
Shell orbicular, depressed above, moderately convex beneath, thin, 
fragile, very faintly striated, yellow, with a blood-red band 
above; spire scarcely convex, depressed; last whorl strongly 
keeled ; aperture oblique, angulated above; columella indistinct, 
somewhat turgid; peristome simple, thin. Height 2, breadth 
34". (Lesson.) 
Helicina zonata, Less. Voy. Coquille. Zool. ii. p. 350? Pfr. Preum. 
Mon. p. 358. 
Hab. The island of Oualan. 
45. HELIcINA VILLOSA. 
Shell orbicular, rather lenticular, thin, pellucid, horn-coloured, 
sharply keeled, covered with a thin periostraca, which is fringed 
and hairy on the keel; spire slightly raised, mucronated ; whorls 
5, rather flat, sculptured with three spiral ridges above the keel, 
last whorl moderately convex and smooth beneath; aperture 
rather triangular; columella very short, forming an acute angle 
with the peristome, which is simple; basal callus shining, sur- 
rounded with an arcuated white line. Height 3, greatest 
breadth 5:, least br. 45 mill. 
Helicina villosa, Anton, Verzeichn. p. 53, n. 1937; Pfr. Ic. n. 27, 
p- 27, t. 5, f. 31-384; Pnewm. Mon. p. 358. 
Helicina pilosa, Sow. Thes. n. 58, p. 12, t. 3, f. 121, 122. 
Hab. Opara. 
§ 7. Peristome not toothed, expanded; shell subglobose, not keeled ; 
spire small. 
46. HELICINA GLOBOSA. B. M. 
Shell rather globose, solid, striated spirally, opaque, yellowish- 
white; spire convex, mucronated; whorls 7, nearly flat, last 
inflated; aperture oblique, entire, semiovate, somewhat tri- 
angular; columella arcuated, flattened; peristome thickened, 
shortly expanded, with the margins joined by a very thin 
callus. Operculum shelly, rather thin, pearly-white externally, 
