36 [Senate 



The following species, chiefly from Ohio, are forwarded for the 

 State Collection. 



Unio nasittus, Say. Dekay's New- York Fauna, Part V, pa. 191, pi. 20, 



f. 239. 

 U. id Barnes. Grould. Lea. 



Potomac river, near Mt Vernon. * 



Unio gibbosus, Barnes. Two varieties. 

 (U. NASUTA, Lam.) 



Grand river, below Grand rapids, Mich. 



Unio pustulosus, Lea. Two varieties. Muskingum river. 

 Unio foliatus, Hild. Lea. Two varieties. Muskingum river, 



Unio cornutus, Barnes. Lea. One variety. Muskingum river. 



Unio ventricosus, Barnes. Lea. Two males and female. Musk- 

 ingum river. 



Unio perplexus, Lea. Two varieties. Ohio. 



Unio retusus, Lam. Two varieties. Ohio. 



(U. torsus, Rafinesque.) 



Unio lachrymosus. Lea. One young specimen. Ohio. 



Unio circulus, Lea. Two varieties. Ohio. 



Unio subrottjndus. Lea. Three varieties. Ohio. 



Unio triangularis, Barnes. Lea. One spec. Ohio. 



Unio mttltiradiatds, Lea. One spec. Ohio. 



Unio securus, Lea. One spec. Ohio. 



Unio mitaneurus, Raf. One spec. Ohio. 



Unio cylindricus. Say. Lea. One spec. Ohio. 



Unio ellipticus, Lea. One spec. Ohio. 



MARaARITANxi, Schumacher. 1817. 

 The name relates to a pearl, as one species, at least, yields pearls. 



1 Margaritana rdgosa, Lea. Two varieties. G-enesee river; Erie 



canal also. 



Alasmodon bugosa. Dekay's New-York Fauna, Part V, pa. 196, pi. 14, 



f. 226. 



Alasmodonta rugosa, Barnes, 1818. Hild. Adams. 



2 Margaritana margin ata. Lea. One specimen. Ohio. 



Alasmodon marginata. Dekay's New- York Fauna, Part V, pa. 196, 



pi. 14, f. 225. 



Alasmodon truncata, Say. 



