but we are informed by the authors of the Defcriptive Cata- 

 logue of Britijh Tejiacea, that Mr. Sower by firft afcertained 

 the glycymeris to be Britifj ; that he found it on the coaft of 

 Cormvall ; and that it is not uncommon on the fliores of 

 Guernjey. That \hQ pilqfa is common in that ifland \vc can 

 fpeak from perfonal knowledge ; and we have fecn the 

 fame in very confiderable abundance near Falmouth, \\\ 

 Cornwall ; but if the fhell found by that gentleman is the 

 fame as that referred to in Knorr, by the authors of the 

 Defcriptive Catalogue , we mofl readily admit it to be dillinft 

 from pilofa, though we cannot find that it is known even as 

 a Guernjey fiiell. We do not however mean to difpute that 

 Area deujla has been found in EiiglamI, but that it is not 

 the common Guernjey shell ; nor does it convince us that it is 

 the LiNN^AN glycymeris. The Guernjey Area, figured by 

 Lister, Tab. 247, and particularly marked as fuch> is per- 

 fe<5lly diftinct from that referred to in Knorr, and yet it is 

 alfo quoted as glycymeris. It is true Lister calls it the 

 Chama glycymeris of Ballon 11, but it is evidently our piloja. 

 In fa6l we believe LiNNi5;us did really make the two fpecies 

 out of one from thofe varieties he obferved in the piloja. 



Several hundred valves of what is now generally con- 

 fidered as Area piloja have been noticed by us on the fliores 

 oi^ Devon and Cornwall, from the largeft to the moll minute, 

 amongft which very confiderable variety have appeared, as 

 well in colour as in the flriature, and in the number of teeth ; 

 as alfo in contour, ibme being more orbicular and com- 

 preiTed. The younger fliells are evidently decuflated, and 

 flattened ; whereas the older not only lofe their beautiful 



markings, 



