4 Trans. Acad. Set. of St. Louis. 



Spiiaerium fabale Prime. 



Off Thunder Bay Island, in 30 fathoms. 



The specimens are rather thin and fragile. The urabones 

 ^re a little more elevated than in typical specimens. 



Class GASTROPODA. 



Superorder Strep ton eura. 



Order CTENOBRANCHIATA. 

 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. 



Yalvata tricarinata Say. 

 Alpena. 

 Only the typical form of this species was collected. 



Family Amnicoijdae. 



Amnicola cincinnatiensis Anthony. 

 Alpena. 



Family Pleuroceridae. 



^GoNiOBASis LiVESCENS Mcnkc. 

 Trowbridge's Dock, Alpena. 



'iGoNioBASis LIVESCENS cuspiDATus Aothony. 



Thunder Bay River. 



The specimens are very uniform and the variety seems 

 quite distinguishable from livescens. 



