10 



SYNOPSIS OF 



FAMILY NAIADES, Lamarck. 



GENUS MARGARITA. 



Subgenus Unio. 



TRIANGULAR. 



angulatus. Lea.* 



Hyria corrugata.t Lam. Sow. 

 Mya angulata. Wood. 

 Unio corrugata. Blain. 

 Unio rugosus. Wagner.X 

 Paxyodon ponderosus. Schum. 

 Triptodon rugosus. Spix.X 



gigas. Lea. 



Lymnadia gigas. Swain. 



* It will be observed, throughout this Synopsis, that where any change has 

 been made of generic or specific names, that I have placed my name there. 

 This is not done with a view to claim any merit, but in accordance with that 

 which is usually done. The object is to show the author of the change, and 

 nothing further. 



■\ This specific name having been used by the older conchologists, as well 

 as Lamarck, for a shell from India, ( Unio corrugata,) it becomes necessary, 

 as I retain that as the older, to change this, which I do, to Wood's name. 



4 On the authority of Ferussac. 



