702 BULLETIN UNITJED STATES GEOLOGICAL SURVEY. 



Family EISSOIDiE. 



Amnicola, Gould and Haldeman. 



limosa, Say. — Bow, Elkhorn, Blue, and Nemeha Rivers. 



granum, Say. — Nemeha Eiver. 

 POMATIOPSTS, Tryou. 



la])idaria, Say. — Eastern jSTebraska, along the Missouri bluifs. 



lustrica, Say. — Eastern Nebraska. 



Family STREPOMATID^. 



(American Melanians.) 

 Pleurocera, Eaf. 



neglectimi, Anthony. — Eare. Blue Eiver. 

 GoNiOBASis, Lea. 



larvceformis f , Lea. — Found only one dead specimen in Nemelia 



Eiver. 

 occulta, Anthony. — Though Tryon regards this as a synonym of G. 

 dejjygis Say, yet I have retained Anthony's name because it most 

 resembles his form. Nemeha Eiver. Eare. 

 semicarinata, Say. — Nemeba and Blue Eivers. 

 Anculosa, Say. 



carinata, Bruguiere. — Nemeha, Blue, and Elkhorn Eivers. 



Family UNI0mDJ3. 

 Unio, Eetzius. 



anodontoides, Lea. — Blue, I^emeha, and Elkhorn Eivers. 



alatus, Say. — Elkhorn, Blue, and Nemeha Eivers. 



asperrimus, Say. — Elkhorn, Blue, and Nemeha Eivers. 



hlandingianus f, Lea, — Nemeha Eiver. A dead shell. 



cainptodon, Say. — Nemeha Eiver. 



capax, Green. — Elkhorn and Blue Eivers. 



circuhis, Lea. — ISTemeha Eiver. 



clavus, Lamarck. — Nemeha and Blue Eivers. 



coccinus, Lea. — Nemeha and Blue Eivers. 



complajiatus, Soland. — Elkhorn and Papilliou Eivers. 



congarceus f, Lea.^Nemeha Eiver. Dead shell. 



cornutus, Bar. — Elkhorn, Blue, and Nemeha Eivers. 



crassidens, Lam. — Blue Eiver. 



cylindricus, Say. — Logan, Blue, and ISTemeha Eivers. 



elegans, Lea. — Nemeha Eiver. 



foliatus, Hild. — Elkhorn and Blue Eivers. 



fragosus, Con. — Bow and Blue Eivers. 



gibbosus, Bar. — Blue and Nemeha Eivers. 



gracilis, Bar. — Bow, Blue, and Elkhorn Eivers. 



gubernaculum, Eeeve. — Eepublican Eiver. 



hebetatus, Con. — A.11 the Nebraska rivers. 



higginsi, he'd. — Nemeha Eiver. 



