Baker — The Molluscan Fauna of Western New York. 79 



35. Sphaerium trans versum Say. 



Stations 4 and 10. Very common. At station 4 it may be 

 found very abundantly just below Brewer's dock, where the 

 specimens lie buried by thousands in the soft mud. 



36. Sphaerium fabile Prime. 



Stations 6 and 9. Very common, particularly in the drift 

 alongr the shore of Lake Ontario. 



*37. Sphaerium partumeum Say. Genesee River. 

 Numbers 34, 35 and 36 are not listed by Walton. 



38. Sphaerium rhomboideum Say. 

 Station 5. Apparently not common. 



Genus Pisidium Pfeiffer. 

 *39. Pisidium variabile Prime. Brighton. 



40. Pisidium abditum Haldeman. 



Station 6. Apparently very common, especially in the drift 

 along shore. 



41. Pisidium bakeri Pilsbry.* 

 Station 9. Very common. 



Class GASTROPODA. 



Subclass Anisopleura. 

 Superorder Euthyneura. 



Order PULMONATA. 

 Suborder Stylommatopliora. 



Superfamily Agnatha. 



Family Circinariidae. 



Genus Circinaria Beck, 1837. 

 Seleniies Fisher. 1878. (Non Hope. 1840.) 



42. Circinaria concava Say. 

 Stations 10 and 11. Fairly common. 



* This is a manuscript name, which is shortly to be published by Prof. 

 H. A. Pilsbry. 



