AMPULLARIA ss subcarinata. 
ee ee 
SPECIFIC CHARACTER. 
Shell reverse, thickish; whorls depressed near the suture, and 
marked by a parallel line; spire short, obtuse; umbilicus 
large, open, slightly carinated, and marked with an internal 
groove. 
Ampullaria subcarinata. Sow. Genera of Shells, f. 4. 
Tue politeness of Mr. G. Sowerby has given us the oppor- 
tunity of examining this rare and little known species, first 
described and acurately figured by himself. It was dis- 
covered, we believe, by Mr. Cranch, the ill-fated naturalist 
who accompanied the unfortunate expedition to the Congo, 
in that river. No specimens, we are informed, have subse- 
quently reached this country. ‘The surface is rough, occa- 
sioned by irregular corrugated wrinkles: the epidermis 
olive. 
AMPULLARIA Nilotica. 
Shell reverse, thin, smooth, whitish, with an olive epidermis finely 
striated longitudinally ; lower half of the basal whorl much 
contracted: spire prominent, obtuse; operculum horny ; um- 
bilicus large, open, the margin obtusely carinated. 
The shell from which our figure was taken we received 
from Mr. G. Sowerby, under the name of Nilotica, some 
years ago. Whether it is the same, or specifically distinct 
from Lamarck’s Guinaica, we have no means of judging, 
otherwise than from the figures he cites of Chemnitz. If 
these are accurate, there are many pvints of difference ; but 
no doubt the Editor of the Bulletin des Sciences, will have 
great pleasure in setting us right upon this subject. 
On attentively comparing the descriptions, given by 
Lamarck, of eleven species of Ampullaria, with those we 
Ampullaria, PI. 2. 
