700 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



Family AEIONID^. 



Subfamily ZONITIN^. 

 ZONITES, Montf. 



fuligmosa, Griff. — Common in a few localities along the Missouri 



bluffs. 

 friabilis, "W. S. Binney. — Southeastern Nebraska. 

 Icevigata, Pfeiffer. — Southeastern Nebraska. 

 inornata, Say. — Eare. Otoe County. 



gularis f, Say. — Found one dead shell in Eichardson County. 

 arhoreiis ?, Say. — Found only one dead specimen near the Nemeha 



Eiver. 



Family PHILOMYCID.E. 



Tebennophorus, Binney. 



carolinensis, Bosc. — Have found only a few specimens in Eichardson 



County. 



Family LIMN^ID^. 



Subfamily LIMN^INJi:. 



LiMN^A, Lamarck. 



stagnalis, Lin. — Eare. Found only north of the Platte. My speci- 

 men from Smith's Lake, Dakota County. 



columella, Say. — Found only one specimen in Smith's Lake, Dakota 

 County, and that imperfect. 



refiexa, Say. — Smith's Lake, Dakota County. Also in Nemeha and 

 Blue Eiv^ers. 



umhrosa, W. S. B, — Only as yet found in Bow Eiver ^londs and 

 Smith's Lake. 



liaydeni, Lea. — Bow, Elkhorn, Logan, Elk Creek. 



2)alustris, Miill. — All the streams of Nebraska. 



desidiosa, Say. — All the streams of Nebraska. 



emarginata, Say. — Bow Eiver. 



catascopium f, Say. — My only specimen obtained in Bow was dead 

 and slightly broken. 



pallida, Adams. — Bow Eiver. 



Immilis, Say. — Sparingly in all streams of Nebraska. 



Mrtlandiana, Lea. — Bow Eiver. 



gracilis, Say. — Bow and Logan Elvers. 

 Physa, Drap. 



lordi, Baird. — Loup and Wood Elvers. 



gyrina, Say. — All the tributaries of the Missouri in Nebraska. 



gyrina var. elliptica, Lea. — Though elliptica is now regarded as a 

 synonym of P. gyrina, I have separately designated it, because 

 in the streams of Nebraska it seems to be well marked. 



ancillaria. Say. — Elkhorn, Nemeha, Loup, and Blue Elvers. 



lieterostropha. Say. — All the streams of Nebraska. 



virginea ?, Gould. — My only specimens found dead in Smith's Lake, 



