45 



We havefeen this fliell not uncommon, burrowed in old 

 thick oyfter fliells from Salcomb bay, and have reaFon to 

 believe it to be partly the caufe of thofe fmall round per- 

 forations fo frequently obferved on that fhell. 



The hinge of this fpecies does not flriclly belong to 

 any one of the prefent genera in conchology ; the 

 teeth though large, and fland very high in proportion, 

 have not the appearance of what are ufually termed pri- 

 viary ; they are broad, flat, more than ufually didant for 

 central teeth, and equally diverge. The oppofite valve 

 is deflitute of either ^''n wary or lateral teeth and has only 

 a flight cavity under the beak. 



Whether this fliell grows to a larger fize remains to be 

 difcovercd : thofe we have found are commonly lefs than 

 above defcribed. That it is perfeftly difl;in8; from any 

 thing we are acquainted with there is no doubt ; and as 

 it feems more nearly allied to the Mya genus than to any 

 other, it is there placed for the prefent. 



GEN. 



