308 CATALOGUE OF PHANEROPNEUMONA. 
lower extremity of the right side; the labium is as thick as the 
labrum. Length 0.55, greatest breadth 0.13, least br. 0.11 inch. 
(Adams.) 
Geomelania gracilis, Adams, Contrib. to Conch. n. 6, p. 95; Pfr. 
Mon. p. 9. 
B. Var. parva, with about 36 ribs; length 0.35 inch. 
Hab. Jamaica. 
6. GEOMELANIA TYPICA. 
Shell slender, conic, whitish, with, on each whorl, about twenty- 
six to thirty prominent acute-edged transverse ribs, which be- 
come obsolete only near the anterior extremity; with very 
numerous microscopic lightly-impressed spiral strie, which do 
not traverse the summits of the ribs; spire with rectilinear 
outlines ; apex truncate, with the loss of 7 or 8 whorls; whorls 
remaining about 7, moderately convex, with a well-impressed 
suture ; aperture ovate, widely and deeply effuse ; labrum well 
expanded, moderately thickened, with the linguiform part at 
the anterior extremity of the right side, excessively produced 
obliquely, very narrow and subacute ; labium well thickened, a 
little reflected, and separated from the penultimate whorl except 
at the upper extremity. Length 0.47, greatest breadth 0.125, 
least br. 0.11 inch. (Adams.) 
Geomelania typica, Adams, Contrib. to Conch. n. 6, p. 95; Pfr. 
Mon. p. 9. 
Hab. Jamaica. 
7. GEOMELANIA EXPANSA. 
Shell much elongate, conic, whitish, rather densely sculptured 
with strong transverse somewhat arcuate ribs, which are flat- 
tened on the forward side, are less regular than in G. minor, 
and are obsolete on the anterior half of the last whorl ; spire 
with rectilinear outlines; apex truncate; nearly 7 whorls re- 
maining, moderately convex, with a well-impressed suture ; 
aperture ovate, much expanded laterally, widely and rather 
deeply effuse anteriorly; labrum but little thickened, slightly 
reflected above, more reflected and widely spread below; labium 
rather thin, a little reflected into the concavity of the central 
region of the penultimate whorl, to which it is appressed. 
Length 0.53, greatest breadth 0.185, least br. 0.15 inch. (Adams.) 
Geomelania expansa, Adams, Contrib. to Conch. n. 2, p. 18; Pfr. 
Mon. p. 10. 
Hab. Jamaica. 
