66 



other much more comprefTed : umbo placed a little to one 

 fide, point fmall, turning forwards : hinge furnifhed with 

 two teeth in each valve, one of which is bifid : in the 

 deep valve two lateral teeth, one more remote than the 

 other. Infide white, with a tinge of blufh colour. Length 

 an inch and a half, breadth two inches ; fometimes larger. 



Da Costa, who gives this fliell by the lixXto^ Pe^un- 

 culus deprejfior, fays he received it from Cornwall. He 

 does not choofe to give Mr. Pennant credit for his Tel- 

 Una crajfa, but makes that fliell his Trigonella plana. 



There is no doubt however that Pennant knew this 

 fhell by his defcription, and fpeaks of it as diltinft from 

 his Venus borealis, the Trigonella plana of Da Costa, 



Doftor PuLTENEY notes it as rare at Weymouth, and 

 on the north ftiore at Poole. 



We have found it plentiful at Falmouth and at Helford 

 in Cornxoall, dredged up with the fand from thofe har- 

 bours, but rarely double or live fhells. 



Alfo on fome parts of the fouth coaft of Devon, parti- 

 cularly Salcomb bay ; and on the coaft of Caermarthen- 

 Jhire in Wales. 



11. 

 Profjcua. Tellina proficua. Puli. Cat. Dorfct. p. 29. 



Peliv. Gaz. t. 93. f. IS. 

 Chem. Conch, vi. t. 12. f. lis. 



Tellina 



