THE FAMILY NAIADES. 



49 



OVAL. 



Myt. cygneus. Gmel. Dill. Mixhl. Monta. 



Mat* Shep. Tur. 

 Myt. anatinus, Gmel. Schum. Wood. 



Monta. Tur. Dill. Mat. 

 Myt. stagnalis. Gmel. Bosc. Schro. Dill. 



Soio. 

 Myt. fluviatilis.t Gmel. 

 Myt. fucatus. Dill. 

 Myt. Zellensis, Gm,el. Schro. Bosc. 

 Myt. Avonensis. Monta. Wood. Ed.Enc. 

 Myt. radiatus.J Muhl. Schro. 

 Myt. incrassatus. Shep. 

 Myt. macula. Shep. 

 An. anatina. Lam. Dill. Drap. Sow. 



Pfeif. Flem. Grat. Des Moid. Bouil. 

 An. sulcata. Lam. 

 An. dentiens. Menke. 

 An. intermidia. Lam. Pfeif. Bouil. 

 An. variabilis. (Var. b.) Drap. 

 An cellensis. Pfeif 

 An. ventricosa. Pfeif 

 An ponderosa.§ Pfeif 



* jS of Maton and Racket (Lin. Soc. Trans., Vol. IV.) is evidently, judging 

 from the figure, Unio litoralis. 



f Gmelin states this shell to be from the fresh waters of Europe, and allied 

 to Anatina. If this be true there cannot be a doubt of its being the same 

 with cygnea. The fluviatilis of Solander and Dillwyn is said to be from 

 North America, and is no doubt the cataracta of Say. 



T On the authority of Dillwyn. 



§ This and the grossa are certainly very different in aspect from the cyg- 

 nea, Lam., being more ponderous and less produced behind. This difference 

 may, however, be effected by locahty. Should it prove constant, ponderosa 



H 



