332 walker: shells of Michigan. 



Ancylus fuscus Ad. Miles, Currier. 



A. parallelus Hald. 



A. tardus Say. 



Valvata tricarinata Say. 



V. „ var. simplex 



V. sincera Say. 



V. striata Lewis. Currier. This species is referred to the 

 preceding by Binney. Currier considers it distinct and, as the 

 specific name "striata" is preoccupied, suggests that of " Lewisit.'' 



V. humeralis Say. Miles. This is a Mexican species and 

 the reference is without doubt erroneous. 



Vivipara contectoides Binn. Binney. Haldenian. 



Melantho ponderosa Say. Sager. Miles. Currier. 



M. decisa Say. 



M. „ var. melanostoma Currier, MSS. 



M. integra Say. 



M. rufa Hald. 



M. obesa Lewis. 



M. Milesii Lea. Lea, Currier. Type specimens from 

 Antrim County, Michigan. 



Somatogyrus isogonus Say. Miles, Currier. 



Amnicola porata Say. 



A. pallida Hald. 



A. lustrica Say. 



A. limosa Say. 



A. Cincinnatiensis Anth. 



A. grana Say. 



Pomatiopsis lapidaria Say. 



P. Cincinnatiensis Anth. This species was cited in the 

 catalogue of Ann Arbor shells on the authority of Mr. Beecher. 



Pleurocera elevatum Say. 



P. neglectum Anth. 



P. subulare Lea. 



J.C, ii., Nov., 1879 



