INVERTEBRATE FAUNA OF LAKE SUPERIOR. 703 



Buiinus Injpnorum LinntTeiis, (Binney, op. cit., part ii, p. 99,) probably 

 occurs in the neighbovhooil of Lake Superior, as it extends far to the 

 uorth and west of it. 



Planorbis bioarinatus Say. 



Biiiney, op. cit., part ii, p. 123. 

 Sault Saiiite Marie, Black River, (Gould ;) also, from stomach of 

 sturgeon takeu at Sand Island. 



Planorbis trivolvis Say. 



Binuey, op. cit., part ii, p. 115. , 



Occurs at Marquette and doubtless at other points on the lake. 

 Planorbis campanulatus Say. 



Binnej', op. cit., part ii, p. 109. 



I found this species at Marquette and at Traverse Island, Keweenaw 

 Bay. 



Gyraulus parvus (Say sp.) 



Biuney, op. cit., part ii, p. 133. 



Common in 8 to 13 fathoms on the south side of Saint Ignace Island, 

 and in 6 to 8 fathoms among the Slate Islands; also, from stomach 

 of white-fish taken at Sault Sainte Marie. 



Gyraulus deflectus (Binney, op. cit,, part ii, p. 129) probably occurs in 

 the vicinity of the lake. 



Segmentina armigcra H. and A. Adams, (Binney, op. cit., part ii, p. 

 137,) extends from iSTew York State to Qreat Slave Lake, and probably 

 occurs with the last sjiecies. 



LAMELLIBRANCHIATA. 



For the identification of n^ost of the species of Sjyhcvrium and Fisid'mm 

 collected by myself I am greatly indebted to Temple Prime, esq., of New 

 York. Eeferences to Mr. Prime's " Monograph of American Corbicu- 

 ladre," published in 1865, in the Sinithsonion Miscellaneous Collections, 

 are added under the species of tiiat family. 



Sph^rium sulcatum Prime. 



Op. cit., p. 33. 



Sault Sainte Marie, (Gould.) 

 Sph^rium aurium Prime. 



Op. cit., p. 35. 



Lake Superior ?, (Prime.) 

 Sph^rium striatinum Prime. 



Op. cit., p. 37. 



A very small specimen was dredged in 8 to 13 fathoms, among Clado' 



