LYMNZA. MELANIA. 45 
with a moderately short acute spire; greyish or 
yellowish ; the lesser volutions not so’ abruptly 
disproportionate to the body as the last. B. 3. 
T. 101. 
L. q@LuTinosa. Semi-globular, extremely 
thin, and inflated, amber-colour ; spire with three 
scarcely produced volutions ; the larger one regu- 
larly striate. B.3. T. 103. . 
LES MELANIENS. 
MELANIA. FLUVIATILE. 
Turreted ; aperture entire, ovate or oblong, effuse 
at the base ; columella smooth, and incurvated ; 
operculum horny. 
M. rruneata. Turreted; apex truncated, 
solid, dark brownish, with small longitudinal ribs, 
the upper ones more prominent ; numerous trans- 
verse striz decussate the ribs; whorls plano-con- 
vex. 12. E. 458. 3 ab. 
M.aMARULA. Ovate-oblong, with the whorls 
transversely keeled above, and the keel spinous ; 
pale chestnut; seven whorls; somewhat ribbed. 
li. W. 35. 164. 
M. FasciouaTA. Oblong-subulate, ventri- 
cose at the base, thin, diaphanous, finely decus- 
sated, greenish white, with brown longitudinal 
