NORTH AMERICAN OONCHOLOGT. 



101 



1. Plate. 



9 V 



rig. 

 94 



98 



9 



T 



97 



10 



r 



95 



11 



vi 



116 



11 







12 



V 



98 a, 1 



13 



V 



99 a, 1 



13 







13 







13 







13 







13 







13 







Tritouidae. 



Kame. Localitj. 



Tritonia Reynolds! Couth. 

 T. arborescens Gotild. 



Crlaucidae. 



Eolldia Bostoniensis Couth. 

 Eolis Bostoniensis Couth. 



rudibranchialis Gould ? 

 diversa Couth. 



Eolis diversa Couth. 

 g3nnnota Couth. 



Eolis ( Tergipes) gymnota Couth. 

 Cavolina salmonacea Couth. 

 Eolis salmonacea Gould. 

 Filurus (n. g.) dubi-os De Kay. 



INFRABRANCHIA. 



Ancylus rivularis Say. 

 calcarlus De Kay. 

 fuscus Adams. 



tardus Say, e. 1. Wabash, river, 



filosus Conrad, e. 1. Alabama. 



NuttaUii Hald. Oregon, 



diaphamis Hald. Ohio, 



parallelua Hald. 



14 



V 



100 a, b 



15 



y 



101 



15 



V 



102 



16 







16 



XXXV 



334 



17 



XXXV 



326 



17 



XXXV 



329 



18 







18 



XXXV 



335 



18 



XXXV 



327 



19 



XXXV 



328 



19 



TECTIBRANCHIA. 

 Aceridae. 



Bulla insculpta Totten. 

 Gouldii Couth. 

 obstricta Gould. 

 Bulla Jluviatilis Say, is referred doubtfully to Physa 



planorbula De Kay. 

 Bulla lineolata Couth. 

 triticea Couth. 

 debllia Gould. 

 Bulla fontinalis Say, referred doubtfully to a Physa. 

 Bulla hiemalis Couth. 

 oryza Totten. 

 canalicnlata Say. 



Volvaria canaliculata Say. 

 Bullina canaliculata Say. 

 solitaria Say, e. 1- Southern coast. 



Bulla insculpta ? 



