262 CATALOGUE OF PHANEROPNEUMONA. 
ward into a callus, which gradually becomes thinner; peristome 
broadly expanded, with the upper margin somewhat sinuate, 
Height 9, greatest breadth 132, least br. 9 mill. 
Helicina Tuncki, Pfr. in Proc. Z. S. 1848, p. 121; Jc. n. 37, p. 33. 
t. 9, f. 1,2; Pneum. Mon. p. 361. 
Hab. San Yago, New Granada (Twnck). 
52. HELICINA NERITELLA. B. M. 
Shell depressed-conoidal, rather thin, very minutely striated, 
opaque, white or yellowish, often marked with two brown bands, 
or with broad reddish-brown bands, which are articulated and 
marbled with white; spire conoidal, with the apex rather 
pepe! whorls 5, scarcely convex, enlarging rapidly, last de- 
pressed, scarcely descending; aperture very oblique, entire, tri- 
angular, as high as broad ; columella somewhat concave at its 
base; peristome simple, expanded, with the lower margin con- 
tinued immediately into a thick basal callus. Height 93, 
greatest breadth 14, least br. 11 mill. 
Helicina neritella, Zam. Hist. vi. p.103, n. 1; Ed. Désh. viii. p. 157; 
Blainv. in Dict. Sc. Nat. xx. p. 455; Malacol. t. 56, f.2; Gray, 
in Zool. Journ. i. p. 65, t. 6, f. 2; Désh. in Encycl. Méth. ii. 
p- 268, n. 2; Sow. Thes. n. 26, p. 6, t. 2, f.. 72-75; Pfr. Ic. n. 39, 
p. 34, t. 4, f. 5-8, t. 6, £18, t. 8, £.9-12, t.9, £.3,4; Pnewm. 
Mon. p. 362. 
Lister, Hist. t. 61, f. 59. 
Helix, n. 29; Schroet. Hinlett. ii. p. 185. 
8. Smaller, variously coloured. (Pfr. Jc. t. 9, f. 32, 33.) 
Helicina variabilis, Guild. in Zool. Journ. iii. p. 529, t. Suppl- 
17, bis. f. 6-10; Sow. Thes. n. 28, p. 6, t. 2, f. 57, 58, t. 3, f. 106, 
109, 129. 
Hab. Barbadoes, West Indies. 
53. HELICINA JAMAICENSIS. B. M. 
Shell subglobose-conic, rather thin, smooth, whitish, often with a 
single horn-coloured band, usually blood-red towards the apex ; 
spire conic, slightly mucronated ; whorls 5, moderately convex ; 
last descending gradually, somewhat flattened beneath; aper- 
ture oblique, nearly triangular; columella terminating in an 
indistinct knot, dilated backward into a thick, semicircular 
callus; peristome thin, yellow internally, with the upper margin 
straight near its insertion, expanded on its lower part. Height 
9, greatest breadth 12, least br. 10 mill. 
Helicina Jamaicensis, Sow. Thes. n. 2, p. 2, t.1, £.3, 4; Pfr. Ie. 
n. 40, p. 35, t. 1, f. 22-26; Pnewm. Mon. p. 363. 
Hab. Jamaica. 
