246 C O N C H O L O G Y. 



has one valve of a chefiiut brown, the 

 other valve milk white. 



Mofl authors rank thefe Shells as a parti- 

 cular family, and call them Pedens. 

 Gualtieri makes different genera of thofe 

 with equal, and thofe with unequal valves; 

 the former he calls Peden, the latter Con- 

 cha Pedinata ; and the Efcallops with un- 

 equal or fingle Ears he calls Pectunculi 

 Linnaeus makes them a genus of Oyfters, 

 and has accordingly arranged them with, 

 and by the names of Oyfters in his 313th 

 genus. 



It is faid, that Efcallops will move fa 

 ftrongly as fometimes to leap out of the 

 catcher wherein they are taken way : their 

 of leaping, or raifing themfelves up, is by 

 forcing their under valve againft the body 

 whereon they lie. 



The 



