300 CATALOGUE OF PHANEROPNEUMONA. 
spire shortly conoidal, rather pointed ; whorls nearly 5, somewhat 
convex, last large, imperceptibly descending; aperture slightly 
oblique, semiovate; columella extremely short, perpendicular, 
terminating in a sharp, small tooth, dilated backwards into a 
thin, granulated callus; peristome thin, narrowly expanded, 
upper margin sinuate, basal margin indented near the columella. 
Operculum shelly, solid, reddish. Height 5}, greatest breadth 
8, least br. 65 mill. 
Helicina succinea, Pfr. in Z. f. M. 1850, p. 76; Ic. n. 97, t. 10, 
f, 15-17. 
Alcadia succinea, Pfr. Pneuwm. Mon. p. 409. 
Hab. Haiti (Sallé). 
11. ALCADIA SOLITARIA. 
Shell depressed, rather thin, very minutely granulated under a 
lens, diaphanous, pale yellow or whitish, with a single fulvous 
band along the suture; spire short, convex; whorls 4-43, 
scarcely convex, last somewhat depressed, a} little more convex 
beneath; aperture oblique, semiovate, rather triangular; colu- 
mella short, concave, terminating forwards in a small tooth, 
dilated backwards into a thin, semicircular, yellowish callus; 
peristome thin, narrowly reflexed, upper margin sinuate, basal 
margin separated from the columella by a slight slit. Height 
41-5, greatest breadth 8-9, least br. 6-7} mill. 
Helicina solitaria, Adams, in Proc. Bost. Soc. 1845, p. 12. 
Helicina Guildingiana, Pfr. in Z. f. M@. 1848, p. 87; Ze. n. 31, 
p. 29, t. 4, f. 37-39. 
Alcadia solitaria, Pfr. Prewm. Mon. p. 410. 
Hab. Jamaica. 
12. ALCADIA DUBIOSA. 
Shell depressed, rather thin, very minutely striated, shining, red- 
dish; spire very little conoidally elevated; whorls 4, scarcely 
convex, last rather flattened beneath; aperture oblique, semi- 
ovate; columella somewhat flattened, triangular, shortly re- 
ceding, dilated backwards into a rather thick callus; peristome 
slightly thickened, white, somewhat expanded. Height 5, 
greatest breadth 8, least br. 7 mill. 
Helicina dubiosa, Adams, Contrib. to Conch. nu. 6, p. 93. 
Alcadia dubiosa, Pfr. Pneum. Mon. p. 410. 
8. Intermedia, Adams, 1. c. p. 94; with the spire less raised and a 
distinct slit near the columella. 
Hab. Jamaica. 
