40 



SYNOPSIS OF 



ARCUATE. 



crassissimus. Fer. Des Moid. Grat. 

 My a crassissima.* Klein. 

 Unio auricularis.* Speng. 

 Unio margaritacea, Drap. 

 Unio sinuata. Lam. Blain. Pfeif. Desk. 

 Unio rugosa.* Poir.? 



monodontus. »S'«y. Eat. 

 Unio soleniformis. Ze«. 



cmarginatus. Lea. 



* On the authority of Fcrussac. 



