ACICULIDZ. 309 
8. GEOMELANIA AFFINIS. 
Shell similar to that of G. expansa, but the aperture is very 
deeply effuse anteriorly, and the linguiform part of the lip is 
excessively produced obliquely and is narrow; the apex is trun- 
cate, with the loss of about 7 whorls. Dimensions nearly as in 
G. expansa. (Adams.) 
Geomelania affinis, Adams, Contrib. to Conch. nu. 6, p. 96; Pfr. 
Mon. p. 10. 
Hab. Jamaica. 
9. GEOMELANIA MEDIA. 
Shell nearly cylindrical, whitish, with, on each whorl, about thirty- 
five much arcuated prominent acute-edged rather slender trans- 
verse ribs; spire with rectilinear outlines; apex truncate ; 
whorls remaining 6, moderately convex, with a well-impressed 
suture ; aperture ovate, widely effuse ; labrum moderately ex- 
panded and thickened, with the linguiform part at the anterior 
extremity of the right side well produced obliquely, not very 
narrow, subacute ; labium well thickened, separated slightly 
from the penultimate whorl except at the upper extremity. 
Length 0.4, greatest breadth 0.107, least br. 0.1 inch. (Adams.) 
Geomelania media, Adams, Contrib. to Conch. nu. 6, p. 96; Pfr. 
Mon. p. 10. 
Hab. Jamaica. 
10. GEOMELANIA VICINA. 
Shell similar to that of G. minor, with a greater divergence ; it is 
usually thinner; the linguiform part of the lip is excessively 
produced laterally, and is very wide; the periphery of the last 
whorl is more angular than in G. minor. (Adams.) 
Geomelania vicina, Adams, Contrib. to Conch. n. 6, p. 96; Pfr. 
Mon. p. 11. 
Hab. Jamaica, 
§ 2. 
11. GEOMELANIA MINOR. 
Shell turreted, truncate, rather thin, glassy-whitish, sculptured 
with crowded and arcuated rib-like strie ; whorls remaining 7, 
the last one forming a little more than a quarter of the whole 
length; aperture ovate, rather triangular; peristome thin, 
scarcely expanded, with the margins joined by callus, right and 
basal margin sinuate; linguiform part blunt. Length 103, 
breadth 3 mill. Aperture not quite 3 mill. in length, 2 in 
breadth at the base, 
