Trans. Acad. Sci. of St. Louis. 



26. Lampsilis radiatus Lamarck. 

 Station 18. Genesee River (Walton). Does not seem to 

 be common. 



*27. Lampsilis rectus Lamarck. Erie Canal. 



*28. Lampsilis rosace us DeKay. 



Of this species Mr. Walton says: " Unio rosaceus is quite 

 local. I have found it only at Long Pond and the margin of 

 Lake Ontario, between Long Pond and Charlotte. DeKay's 

 figures are very characteristic of all I have collected." 



29. Lampsilis alatus Say. 

 Station 10. Also one small specimen from Niagara Falls 

 (Acad. coll.). Erie Canal (Walton). The specimens from 

 the Genesee River are very large and fine, with a deep purple 

 interior. 



*30. Lampsilis cariosus Say. Erie Canal. 



31. Lampsilis complanatus Solander. 



Station 10. The specimens from this locality are very thick 

 and heavy. 



32. Unio tappanianus Lea. 



Station 10. Apparently not common. 



Order TELEODESMACEA. 



Suborder Veneracea. 



Family Corbiculidae. 



Genus Sphaerium Scopoli. 



33. Sphaerium simile Say. 



Stations 5, 9, 10 and 17. Erie Canal (Walton). Very com- 

 mon and grows to a large size, particularly at station 10, 

 where it may be found in great abundance along the shore in 

 the soft mud. 



34. Sphaerium stamineum Conrad. 

 Stations 9 and 10. Very common. 



