22 



2. 

 Parvus. Pholas Parvus. Br. Zool. t. 4. f. 13. 



Tab. 1. f. 7. S. Da Cojia. p. 247. 



P with a rough white fiiell tranfverfely and longitudi- 

 nally ftriated, except at the fmaller end; the larger end 

 declines into a kind ot" beak, where it is muricated : hinge 

 reflex without cells : plate at the back one, connefted by 

 a membrane to the valves; no acceflbry plate below the 

 hinge; teeth, one in each valve, flender, curved, fur- 

 niflied with a knob at their bafe. Len!;th half an inch : 

 breadth one inch. 



This fpecies was originally given by Mr. Pennant, 

 but has ever fince been confounded with the Da&yhis 

 and Crifpatiis. 



From the former it may be readily known by not leav- 

 ing any cells on the reflefted margin of the hmge; from 

 the latter in not havingr the lonsjitudinal furrow; and 

 from both by the knob at the bafe of the tooth. 



It is longer in proportion to its breadth than the Dae- 

 tylus, and fliorter than the Crifpatiis. 



If this fliould be the fliell defcribed in the BriiiJJi Zo- 

 ology of which we can but little doubt, it h unfortunate 

 that the elFential characters were omitted, efpecially as it 

 is ftated to be like the Crifpatiis externally, but never 

 found larger than a hazel nut. From this circumflance 



probably 



