280 CATALOGUE OF PHANEROPNEUMONA. 
Operculum nearly triangular, pale. Height 23, greatest breadth 
42, least br. 3} mill. 
Helicina Louisiadensis, Morbes, in Voy. Rattlesnake, App. p. 382, 
t. 3, £.5; Pfr. Pneum. Mon. p. 385. 
Hab. Round Island in Coral Haven, Louisiade Archipelago (Mac- 
gillivray). 
§ 10. Peristome not toothed, expanded; shell slightly keeled. 
106. HenicinA SowERBYANA. 
Shell depressed-trochiform, rather thin, spirally grooved with 
impressed lines, white ; spire conic, rather pointed ; whorls 6, 
nearly flat, the last slightly keeled, more convex beneath ; aper- 
ture somewhat oblique, nearly triangular; columella thin, ter- 
minating in a knot, dilated backwards into an extremely thin 
callus ; peristome simple, spreading angularly, with the upper 
ao con sinuate. Height 14, greatest breadth 21, least br. 17 
mill. 
Helicina Sowerbyana, Pfr. in Proc. Z. 8. 1848, p. 124; Ic. n. 65, 
p- 50, t. 6, f.9, 10; Pneum. Mon. p. 385. 
Hab. Guatemala (Lattre). 
107. HELICINA OCCIDENTALIS. Jeon 
Shell depressed, rather thin, slightly granulated by oblique lines, 
whitish-yellow, clouded and varied with reddish-brown ; spire 
short, conoidal, rather mucronate; whorls 6, nearly flat, last de- 
pressed, angulated, almost flat beneath ; aperture very oblique, tri- 
angular; columella short, terminating in a slight knot, dilated 
backwards into a diffused callus ; peristome expanded, reflexed, 
with the upper margin depressed. Operculum semiovate, black- 
ish-chestnut-coloured. Height 102, greatest breadth 19, least 
br. 15 mill. 
Helicina fasciata, Gudlding, in Linn. Trans. xiv. 2, p. 339 (not 
Lamarck). 
Helicina occidentalis, Guild. in Zool. Journ. iii. p. 529, t. 15, 
f. 6-10; Désh. in Lam. Hist. viii. p. 164, 0.19; Sow. Thes. 0.30, 
p. 7, t. 2, £.86, 87; Pfr. Ic. n. 66, p. 51, t.6, £.19, 20 (i. 19, 
t. A. f. 13, from Guild.) ; Pneum. Mon. p. 386. 
Pachytoma occidentalis, Swains. Malac. p. 337 (p. 184, f. 28). 
8B. Smaller; with more distinct red bands. 
Hab. The Island of St. Vincent, 2000 feet above the level of the 
ocean. 
