4 
lacustris. 
— Dr. Maton’s and Mr. RACKETT's 
Linnsus. It will not, however, agree with his descrip- 
tion * striis rugosis subramosis." Chemnitz has figured the 
latter species, which appears to correspond exactly with 
the characters above mentioned. 
. Found on the Western coast, by Mr. Laskey. (Donovan.) 
P. testa integerrima, ovali, membranacea; vertice mu- 
 cronato, reflexo. Linn. Fauna Suecica, n. 2200. Syst. 
Nat. p. 1260. n. 769. Linn. Gmel. p. 3710, 
Lister Anim. Angl. t. 9. f. 39. Conch. t. 141. f. 39. 
Gualt. Test. t. 4. f. B. B. | 
D’ Argenv. Conch. t. 27. f. 1. le 3"* Patelle. 
Muller Verm. p. 201. n. 386. 
Pennant Brit. Zool. À. n. 149. 
Da Costa Brit. Conch. p. 1. t. 2. f. 8. 
Schrót. Flussconch. t. 5. f. 1, 2, 3. 
- Favanne Conch. 4. 61. f. A. 8,4. 
— Pulteney in Hutch. Dorset. p. 51 t. 22. f.8. 
— Donovan Brit. Shells, t. 147. 3 
Montagu Test. Brit. p.382. P. Buviatilis- z 
Habitat in fluviis, rivis, stagnis, saxis et plantis aquaticis adhærens ; fre- 
quens. 
Testa diametro + poll., subdiaphana, fragilis, subalbida, Vertex coarctatus, 
margini approximatus. ; 
Varietas interdum a vertice striata. 
, First figured and described by Lister. 
One of Linnzus’s references, Gualt. Test. t. A. f. A. A. 
= T répresents the following species, viz. P. oblonga ; but it 
| is evident. from his specific. characters, that he meant to 
€ ibe Lister’ s shell, Anim. Angl. t. 2; y^ 32., to which 
he has. also referred. Gmelin has transferred all the 
ynon yAR A thin aa of | Linneeus to bis. own P. flu- 
viatilis, 
/ 
