135 



L. stag'nalis, Linn. 



Family LIMNAEIDAE. 



Subfamily LIMNAEINAE. 



LIMNAEA, Lamarck. 



Ingalls ; Lewis ; Robinson. 



R. ampla^ Mighels. 

 R. columella, Hay. 



B. megosoma, Say. 



Subgenus RADIX, Montf. 



Aldricli. 

 Ingalls ; Lewis. 



Subgenus BULIMNEA, Uald. 



Lake Champlaiu (Ingalls), [Adams' Vermont 

 Shells.] 



Subgenus LIMNOPHYSA, Fitz. 



L. reflexa. Say. 

 L. elo(Ies,^° Say. 

 L. desidiosa, Say. 

 L. emarg^inata, Say. 



L. catascopium, Say. 

 L. unibilicata,!^ Adams. 

 L. pallida, Adams. 

 L. hnmilis, Say. 



B. & B., Western New York. ? 



Aldrich ; Ingalls ; Lewis ; Hubbard. 



Aldrich ; Ingalls ; Lewis. 



Owasco Lake (Lewis). Probably will be found 



in other lakes. 

 Ingalls ; Lewis. 

 Aldrich; Ingalls; Lewis. 



Lake Champlain (Adams); Little Lakes (Lewis). 

 Aldrich ; Ingalls ; Lewis. 



A. gracilis, Jay. 

 A. galbana, 'I Say. 



P. Hildrethiaiia, Lea. 

 P. ancillaria, Say. 



Subgenus ACELLA, Bald. 



Aldrich (in letters) ; Ingalls ; Lewis ; Squaw 



Island, Niagara River (David F. Day). 

 (Fossil) Lewis. [In calcareous tufa.] 



PHYSA, Drap. 



Robinson. 



Aldrich ; Ingalls ; Owasco Lake (Lewis). 



•0 Say's name for this species is retained, because they who identify our shells with analogous 

 European forms do not preserve the parallel by identifying catascopium with pereger, as should 

 follow, as a natural sequence. The full discussion of this topic would require too much space at 

 tills time. 



" Eastern collectors hesitate to place umbUicata in tlie synonymy of L. caperaia. Say, which 

 seems to be related to imibilicata as reflexa is to elodes. 



