310 Mr. Jerrreys on the Testaceous Pneumonobranchous 
versim substriata. Anfractus 6. Apertura oblonga, 
angustior, plicis 2 columellaribus munita: peristomio 
simplici. 
Long. 0.175.—Diam. 0.065. 
Voluta alba. Mont. Test. Brit. p. 235? (not of the 
Suppl.) Turton’s Conch. Dict. 
Not uncommon among the rejectamenta of streams, near 
their communication with the sea. 
The Voluta triplicata of British authors (if a true Auri- 
cula) has as yet only been found in Guernsey ; and is there- 
fore not admissible into the present catalogue. 
Familia III. LIMNH ADE. Leach. 
Tentaculis compressis, triangularibus. 
Divisio I. Testa cochleeformis. 
S Testa turrita. 
13. Limneus. 
14. Physa. 
Tentaculis compressis, subulatis. 
8§ Testa discoideà. 
15. Planorbis. 
-Divisio i. Testa patelleformis. See ee 
16. Ancylus. Se et 
Genus XIII. LIMNEUS. Drap. 
Animal tentaculis brevibus. Sustentaculum latum, anticé bifidum. 
Testa ovato-oblonga, seu elongata, interdim subconica. Apertura 
scoxeto oblonga, ad basin effusa : peristomio simplici, po- 
_ sticé subreflexo :  columellá revoluta. | 
Al the inhabitants of this genus may be truly termed 
amphibious, 
