VALVATA. 
37 
Mr. Alder observes {Mag. Zool. and Bot. ii. 117.), 
Dr. Turton has introduced two other species, 
V. planorbis Drap. (f. 116.), and V. minuta Drap. 
(f. 117.), into his Manual, but no specimens of them 
are now to be found in his cabinet.” Mr. Alder 
says he took some pains to Fig, 9. 
investigate these two species 
when in Paris, on examining 
three of the principal collec- 
tions there ; those of the Jar- 
din des Plantes, the Baron 
de Ferussac, and the Due de a, animal ; b, gill ; 
Rivoli. In the latter only, c, operculum. 
I found any thing under the name of V. pla~ 
norbis. The specimens (which were originally La- 
marck’s) were V. cristata Muller. M. de Ferussac 
had specimens, under the name of V. minuta,, from 
two different individuals. Those from M. Pfeiffer 
are, I think, the young of V. cristata j and the others 
(I forget from whom, but with the name of Dra- 
parnaud) the young of V. piscinalis. Mr. Miller in- 
troduced V. minuta into his catalogue of the land and 
freshwater shells of the environs of Bristol, but no 
specimen of it is preserved in the Bristol Museum. 
Dr. Turton says that his V. minuta is the Helix 
serpuloides of Montagu. This is well known to be 
a marine shell, referrible to the genus Shenea of 
Fleming. Mr. Thompson of Belfast has, however, 
favoured me,” continues Mr. Alder, with the ex- 
amination of a shell which may possibly turn out to 
be the V. minuta Drap., though I suspect it to be 
marine.” 
