PLATE CXLVf. 



scribes, we have no hesitation in saying that it is not the Patella 

 mammillaris of Gmelin, as some conchologists imagine. Specimens 

 of the latter we are likewise in possession of, but they are not cer- 

 tainly known to be natives of this country. — In Lifter Conch, 

 t. 537. fig. 17 ; and in Martini. Conch. 1. /. l.f. 58, 59. P. mam- 

 millaris is very accurately figured ; and a slight'comparison of either 

 of them, with the shell figured in the annexed plate, will prove 

 very clearly that they cannot be of the same species. 



