102 



CnEMNiTZ, we could not have fuppofed he intended this 

 fhell. 



This fpecies was given the name prefixed to it by Doc- 

 tor SoLANDER, as we are informed bv Doclor Pulteney, 

 who has verv well defined the didinftion between this and 

 the lutraria, by obferving, that the hinge is placed much 

 nearer to the pofterior fide; is always finuous, or much 

 hollowed on the margin below the hinge, towards the an- 

 terior or long fide. It is a much more rude and rough 

 fiicll ; and is difiinguiflied farther, by a ftrong thick rib 

 on the infide, running in a curved direftion trom the 

 edge, towards the hinge. And adds, that the markings 

 of the cicatrix of the animal, is of a different fiijure from 

 that of the M. lutraria: a circumftance not fufhciently 

 adverted to, as yet, in the defcription and diltinftion of 

 fliells. We may add to this definition, that the tooth is 

 QOt triangular, as in that fpecies, 



This appears to be a local fhell ; it is not uncommon in 

 t-he river between Truro and Falmouth in Cornwall ; and 

 is frequently brought up with the fea-fand to the former 

 place, which is there colle6led for manure. We have alfo 

 found it in Falmouth harbour not fb common, and rarely 

 double valves : live fliells are feldom taken ; from which 

 we conclude it penetrates deep in the fand. Doftor PuL- 

 TENEY fpeaks of it as not uncommon on the Dorfet coafl; 

 and fingle valves are fometimes found on the fhores of 

 Devonjhirc. 



GEN, 



