TO 



BIBLIOGRAPHY OF 



6 

 7 

 8 

 9 

 10 

 11 



12 

 14 



i 



1 Ancylus rivularis Say. 



Locality. 



N. Engl., N. Y., Ohio, 

 111., N. W. Terr. 



S. Car., Mexico? New- 

 Orleans, Oregon. 



New England, N. Y., 

 Pa., N. W. Terr. 



Mass., Lake Erie, Ind. ? 



New Orleans, S. C. 

 N. W. Terr., Oregon. 

 New England, N. York, 

 Western States. 



Mass. , 0., Del. riv., Md. 



New England, Ohio, N. 

 W. Terr. 



East., Midd., & West. 

 States, N. W. Terr. 



N. England, Lake Su- 

 perior, ike. 



East., West., & Midd. 



States, N. W. Terr. 

 Del. and Susq. rivers, 



var. in James river. 

 Holston river, Va. 

 Wabash, Vermont. 

 Ohio. 



Nolachucky river. 

 Bl'k Warrior riv., Ala. 

 New England. 



2 depressus Uald. 



3 tardus Say. 



4 diaphanus Hald. 



5 obscurus Ilald. 

 filosus Conr. 



6 parallelus Ilald. 



A. rivularis Gould non Say. 

 i 7 fuscus Adams. Fresh pond, Camhridge, Mass 



i 8 crassus Hald. Oregon. 



Index — Planorbis parallelus Say. = 

 Helix lineata? 

 of cover Amnicola tenuipes Couper. Hopeton, Ga. 



" Melania substricta Hald. Tennessee. 



" conica Say (name restored). 



substricta Hald. (withdrawn from the species). 

 " pilula Lea = Anculosa littorina Hald. 



