THE FAMILY NAIADES. 



131 



FAMILY NAIADES.— Zamarcfe. 



GENUS MARGARITA. 





IS 



I. SUBGENUS UNIO. 



TRIANGULAR. 



*angulatus. a. Lea.f 



Hyria corrugata.| Lan». Sow. 

 Mya angulata. Wood. 

 Unio corrugata. Blain. 

 Unio rugosus. rFag'ner.§ 

 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. 



Mya syrmatophora. Gronovius. 

 Wood. Dill. 



Gmel. 



m 



w 

 12; 

 o 



w 



Hi 



o 



K 



Ph 



m 



TRIANGULAlt?* 



Hyria avicularis. Lam. Crouch, 

 Hyria syrmatopiiora. So^, 

 Hyria elongata'?|| Swain. 

 Unio caudatus.§ Wagner. 

 Prisodon obliquus. Schum. 

 Prisodon truncatus. Schum, 

 Diplodon furcatum.§ Spix. 



*Brownianus. Lea. 



s 



*laevissimus. Lea. 



Symph. laevissima. Lea, in Trans. 



.Am. P. S. Eaton. 

 Unio Isevissima. Deshayes. 



* gracilis. Barnes. Hild. 

 Unio planus. Barnes. 

 Unio fragilis. Swain. 

 Symj^. gracilis. Lea, in Trans. Am. 

 P. S. Eaton. 



^'compressus. Lea. 



Symph. compressa. Lea, in Trans. 

 Am. P. S. 



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



t It will be observed, throughout this Synopsis, th^ 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. 



I This specific name having been used 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." t have never seen the shell, and feel too much 

 in doubt to insert it as such. 



VI. 2 F 



