Testaceous Pneumonobranchous MoUusca of Great Britain." 513 



I was wrong ia saying the B. ventricosus of Draparnaud is a 

 variety of this species ; though the transition to our species 

 through the variety a is certainly very slight. This last variety 

 Mr. Lowe tells me he found in great abundance on lona island 

 in the summer of 1824. 



ClONELI.A. 



C. lubrica, p. 347. 



Var. a virescenti-alba, hyalina. 

 Pentifully in the grounds of Tawstock (Sir Bourchier Wrey's) 

 House, near Barnstaple, North Devon. 



Clausilia. 

 C. nigricans, p. 351. 



Var. a. alba. Dinton Hall, Bucks : Rev. Dr. GoodalL 



C. parvula, p. 352. 



There is a specimen of this shell in Dr. Leach's Cabinet, Bri- 

 tish Museum. 



C. plicatula, p. 354, lege Rolphii. 



Animal nigrescens, superne valde corrugatum. Susten- 

 taculum angustius. 

 C. pumila. Pfeifer, iii. 41. Taf. vii. Jig. 16? 

 I believe this to be a distinct species from the C. plicatula of 

 Draparnaud ; and Leach's name of Rolphii (which has been 

 published by Mr. Gray in one of the Numbers of the London 

 Medical Review for 1821) should perhaps be adopted. 



C. labiata, p. 353. 



Not an uncommon species in Sicily and the Ionian Archipe- 

 lago. Mr. G. B. Sowerby furnished me with specimens from 

 the late Mr. G. Humphrey's collection ; and he supposes that it 

 was through the same channel introduced into Montagu's Bri- 

 tish Catalogue. Mr. Lyons informs me that his specimen was 

 presented to him by Miss Pocock. 



3 u 2 C. ven- 



