4 Trans. Acad. Sci. of St. Louis. 



Sphaerium fabale Prime. 



Off Thunder Bay Island, in 30 fathoms. 



The specimens are rather thin and fragile. The umbones 

 are a little more elevated than in typical specimens. 



Class GASTROPODA. 



Superorder Streptoneura. 



Order CTENOBEANCHIATA. 

 Family Viviparidae. 



Campeloma milesii Lea. 



Long Lake. 



The specimens seem to be quite typical, as figured and 

 described by Walker, Nautilus, XVI, p. 121, 1903. 



Campeloma rufum Haldeman. 

 Ox Bow; Thunder Bay River. 



Family Valvatidae. 



Valvata sincera Say. 

 Alpena. 



Valvata tricarinata Say. 

 Alpena. 

 Only the typical form of this species was collected. 



Family Amnicolidae. 



Amnicola ciNCiNNATiENSis Anthony. 

 Alpena. 



Family Pleuroceridae. 



GoNiOBASis livescens Menke. 

 Trowbridge's Dock, Alpena. 



GONIOBASIS LIVESCENS CUSPIDATUS Authouy. 



Thunder Bay Elver. 



The specimens are very uniform and the variety seems 

 quite distinguishable from livescens. 



