S E C T I ON VU. 139 



not properly twirled or produced, when 

 jtheir beaks are pointed and fituated fide- 

 ways% I cannot think it a charader fuffi- 

 .cient or ftrong enough to form a genus, 



I have already obferved, that in the vaft 

 volume of Seba, it is very remarkable, not 

 a fingle Limpet is figured, defcribed, or 

 even mentioned. 



The Limpets, though not feemingly fo, 

 are a numerous family. I have recognized 

 about feventy fpecies. 



The firft genus, or whole Limpets, Is 

 yery numerous. The fecond, or Cham- 

 bered Limpets, has many fpecies : but the 

 third genus, or perforated Limpets, or 

 Malks, has but few fpecies. The enu- 

 meration of all the fpecies appertains more 

 properly to a hiftory of Shells, than to 

 thefe rudiments, 



* Concho-lcpas, Cochlea-lcpas, &c. 



Europe 



