INVERTEBRATE FAUNA OF LAKE SUPERIOR. 703 



Bulinus hypnorum Linureus, (Binnej'', op. cit., part ii, p. 99,) probably 

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

 uortli aud west of it. 



Planorbis bicarinatu!^ Say. 



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

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

 sturgeon taken at Sand Island. 



Pl,anorbis trivolvis Say. 



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



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

 Planorbis campanulatus Say. 



Binuey, oj). cit., part ii, p. 109. 



I found this species at Marquette and atTraver.se Island, Keweenaw 

 Bay. 



Gyraulus parvus (Say sp.) 



BiuDpy, 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 j also, from stomach 

 of white-fish taken at Sault Sainte Marie. 



Gi/rauhis deflectus (Binney, op. cit., part ii, p. 129) probably occurs in 

 the vicinity of the lake. 



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

 137,) extends from I^ew York State to Great Slave Lake, aud probably 

 occurs with the last species. 



LAMELLIBRANCHIATA. 



For the identification of most of the species of Spliwrium and Flsidium 

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

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

 ladie," published in 18G5, in the Smithsonion Miscellaneous Collections, 

 are added under the species of that family. 



Sph^riu3I SULCATU3I Prime. 

 Op. cit., p. 33. 

 Sault Sainte Marie, (Gould.) 



Sph.1j]rium aurium Prime. 



Op. cit., p. 35. 

 Lake Superior ?, (Prime.) 



SPH.ERIUM STRIATINUM Prime. 



Op. cit., p. 37. 



A very sujall specimen was dredged in 8 to 13 fathoms, among Clado- 



