42 



MARGARITANA. 



IV. SUBGENUS MARGARITANA. 



C5 





-A 





< 

















- 



M 



~ 



g 







PM 





oa 





TRIANGULAR. 



*complanata. Lea. 



Alas, complanata. Bar. Hild. 

 , Sow. 

 Symph. complanata. Lea, Trans. 



Am. P. S. 

 Unio complanata. Desk. 

 Unio Katherina. Lea. 



QUADRATE. 



*confragosa. Lea. 



Alas, eonfragosa. Say. 

 Unio eonfragosa. Desk. 



TRIANGULAR. 







*arcula. Lea. 







OBLONG. 







*marginata. Lea. 







Alas, marginata 



Say. 



Bar. 



Gould. Migh. Lins. 



Lelcay 



Stimp. 







Alas, truncata. 2 



Say. 





Unio cariosa. (Var. 2.) 



Lam. 



Unio varicosa. 



Lam. 





Unio calceolus. 



Say, not of Lea. 



My a regulosa. 



Wood. 





Alas, corrugata. 



LeJcay. 





OBLONG. 



*rugosa. 3 Lea. Kirtl. 

 Alas, rugosa. Bar. Eat. Hild. 



Adams. Delcay. 

 Alas, abducta. Say. 

 Qomplanaria rugosa. Stimpson. 



(Agass. MSS.) 



f TRIANGULAR. 



*deltoidea. Lea. 

 *minor. Lea. 

 *Ourreyana. Lea. 



*undulata. Lea. 



Alas, undulata. Say. Bar. Swain. 

 Gould. Kiist. Adams. Linsl. 

 Lehay. Migh. 

 Alas, sculptilis (junior). Say. 

 Strophitus sculptilis. Stimpson. 



(Agass. MSS.) 

 My a undulata. Wood. 

 Unio Mans. Valen. 

 Unio glabratus. Soiv. 



OVAL. 



*Raveneliana." Lea. 



1 The genus Margaritana was proposed by Schumacher, in his Essai d'un Nouveati Systeme des Habitations 

 des Vers Testaces, published in 1817, for the Mya margaritifera, Lin. (Unio elongata, Lam. and Alasmodonta 

 arcuata, Bar.). Mr. Say, in 1818, proposed to establish this same division under the generic name of Alasmodonta. 

 The Danish zoologist, having priority of date, must have his name preferred. Mr. Gray, in his Genera, adopts 

 Margaritana, but he cites Baphia, Gevers, in 1787. I have no access to Gevers's writings, and I do not understand 

 why Schumacher should have priority given by Mr. Gray, if the date be correct. 



2 Several specimens of fine marginata have been sent to me from the west, marked Alas, truncata, Say, being 

 one of his unpublished names, but given by him to various conchologists under that name. I have never considered 

 it distinct from the marginata of the eastern rivers, although it is generally larger and of finer color in the exterior. 



3 I found the oviducts of M. rugosa fully charged on the 20th May. 



4 It has been supposed that this might be the marginata, Say, but in a specimen received from Prof. Troost, 

 and returned to him, I found the beaks to differ essentially, the undulations being small and numerous at the tip. 



