48 



SYNOPSIS OF 



SUBGENUS ANODONTA. 



OVAL. 



magnifica. Lea. 



Symp. magnifica. Zea, Trans. Am. P. S. 



Woodiana. Lea. 



Symp. Woodiana. Lea, Trans. Am. P. S. 



Benedictensis. Lea. 



Symp. Benedictensis. Lea, Trans. Am. 

 P. S. 



H 



^< 



o 



P4 



OBOVATE. 



crispata. Lam. 



OVAL. 



I 



cygnea.* Draj). Lain. Crouch. Blain. 

 Pfeif. Turt. Des Afoul. Flem. 

 Grat. Bouil. 



* I have, after a good deal of consideration and examination of my speci- 

 mens and the figures in the numerous works describing the J^'aiades, satisfied 

 myself that .in. cvgnea and .Ju. anatina are not specifically distinct. If the 

 observation of M. Poiret, that the first is viriparous and the last oviparous, 

 be correct, then they should be certauily separated. I feel perfectly per- 

 suaded, however, that he must be in error. Turton, in his recent work on the 

 Land and Fresh Water Shells of Great Britain, says he is " inclined to think 

 that all our supposed species of this genus may be justly resolved into one." 



