THE FAMILY NAIADES. 



13 



FAMILY NAIADES.— Zamorcfe. 

 GENUS MARGARITA. 



m 



z 

 o 



z 



M 

 H 



S 



en 



B 



%< 



I. SUBGENUS UNIO. 



TRIANGULAR. 



*angulatus. Lea.f 



Hyria corriigata.| Lam. Sow. 

 Mya angiilata. Wood. t 



Unio corrugata. Blain. 

 Unio rugosus. Wagner. § 

 Paxyodon ponderosus. Schum. 

 Triplodon rugosus. Spix.§ 



gigas. Lea. 



Lymnadia gigas. Swain. 



*inflatus. Lea. 



Symph. inflata. Lea, in Trans. Am. 

 P. S. 



*alatus. Say. 



Unio alatus. Say. Lam. Swain. 



Bar. Hild. 

 Mya alata. Wood. 

 Symph. alata. Lea, Trans. Am. P. S. 



*syrmatophorus. Lea. 



Myasyrmalopliora. Gronovius. Gmel. 

 Wood. Dill. 



TRIANGULAR. 



Hyria avicularis. Lam. Crouch. 

 Hyria syrmatophora. Sow. 

 Hyria elongata'?|| Swain. 

 Unio caudalus.§ Wagner. 

 Prisodon obliquus. Schum. 

 Prisodon truncatus. Schum. 

 Diplodon furcatum.§ Spix. 



*Brownianug. Lea. 



*lsevissimus. Lea. 

 Symph. laevissima. 



Lea, in Trans. 



Am. P. S. Eaton. 

 Unio laevissima. Deshayes. 



♦gracilis, 



Barnes. Hild. 

 Unio planus. Barnes. 

 Unio fragilis. Swain. 

 Symph. gracilis. Lea, in Trans. Am. 

 P. S. Eaton. 



*compressus. Lea. 

 Symph. compressa. 

 Am. P. S. 



Lea, in Trans. 



* All the species preceded by an * are in ray Cabinet. The inner column forms the.Synonyms. 



t It will be observed, throughout this Sytiopsis, that where any change has been made of generic or speci- 

 fic names, that I have placed my name there. This is not done with a view to claim any merit, but in accord- 

 ance with that which is usually done. The object is to show the author of the change, and nothing further. 



{ This specific name having been us^ by the older conchologists, as well as Lamarck, for a shell from In- 

 dia {Unio corrugata), it becomes necessary, as I retain that as the older, to change this, which I do to Wood's 

 name. • 



§ On the authority of Ferussac. 



II Mr Gray thinks this to be a " perfectly distinct species." I have never seen the shell, a.rfi feel too much 

 in doubt to insert it as such. ' 



D k 



