138 THE NAUTILUS. 



Currier and DeCamp ; the latter, however, now considers it a 

 strongly marked form of V. sineera. V. humerali.s as cited by Miles, 

 is undoubtedly a form of this species. 



Lyogyrus pupoidea Gld. Cited by DeCamp. 



Vivipara contectoides W. G. Binney. The only reference to the 

 occurrence of this species in Michigan, that I know of, is that made 

 by Binney (Land and Fresh-Water shells II, p. 24), It does not 

 appear to have been found by any of our local collectors and must 

 be considered a very doubtful member of our fauna. 



Campeloma ponderosa Say. Cited by Sager, Miles and Currier, 

 but does not appear in any of the later lists and must be considered 

 a doubtful species in Michigan. " I have never seen it from this 

 state as I found it in Alabama. It is not a northern species." W. 

 H. DeCamp. 



C. decisa Say. Common and variable. Sinistral specimens are 

 cited by DeCamp as var. heterostroj^ha DeKay. 



C. rfecisa^ava Currier Mss. Specimens from Long Lake, Grand 

 Traverse County are so named by Mr. Pilsbry. A very beautiful 

 form of this common species. 



C. decisa melanostoma Currier Mss. A small form from Grattan, 

 Michigan, was sent to me under this name by Mr. Streng. 



C. Integra Say. Common everywhere. 



C. rufa Hald. Generally distributed over the State, but not as 

 common as C. Integra and decisa. 



G. gibba Currier. I know nothing of this form beyond the 

 description by Currier and Dr. Jas. Lewis' critical remarks thereon 

 in the American Journal of Conchology (III, p. 112 and IV, p. 81.) 



0. Milesii Lea. Originally described from Antrim County. The 

 reference of specimens from the Detroit river to this form has been 

 approved by Mr. Pilsbry. 



G. obesa Lewis. Quite common throughout the State and 

 frequently of large size. 



C. subsolida Anth. Cited by DeCamp. Specimens from the 

 Boardman river. Grand Traverse County, identified as this specimen 

 by Prof R. E. Call are referred to decisa by Tryon and Pilsbry. 



Lioplax subcarinata Say. Dr. Leach informs me that a single 

 specimen from Higgins Lake, Roscommon County, was referred to 

 this species by Mr. Tryon. 



