AUGHEY ON SHELLS OF NEBRASKA. 701 



iu Dakota County. It corresponds to the description of Gould's 



species from Colorado ! 

 BuLiNUS, Ad an son. 



hypnorum, Liu. — In all the quiet waters of Nebraska. 

 distortus, Haldemau. — Rare ; in the Nemeha River. 



Subfamily PLANORBIN^. 



Planorbis, Guettard. 



glahratua, Say. — Rare ; only in the Nemeha River. 



campanulatus, Say. — Bow River. 



onultivolvis, Case. — Rare ; Bow River. 



trivolvis, Say. — All the streams of Eastern Nebraska. 



trivolvis var. fcdlax, Haldeman. — Found in Smith's Lake, Dakota 

 County. 



hicarinatus, Say. — All streams of Eastern Nebraska. 



exacutus, Say. — All streams of Eastern Nebraska. 



dejlectus, Say. — All streams of Eastern Nebraska. 



deflectm var. virens, Adams. — Found in the Nemeha and Smith s 

 Lake in Dakota County. 



alhtis, Miill. — Bow River, Logan. 



2Jarvus, Say. — All the streams in Eastern Nebraska. 

 Segmentina, Fleming. 



armigera, Say. — Bow and Loup Rivers. 

 Ancylus, Geoftroy. 



diaphanus^ Haldeman. — Bow River. 



rivulariSj Say. — Bow River. 



caurinus, Cooper. — Logan, Elkhorn, Nemeha, and Blue Rivers. 



Family VALVATID.E. 

 Yalvata, O. F. Miill. 



tricarinata, Say. — Papillion and Elkhorn Rivers. Rare. 

 sincera, Say. — Bow and Elkhorn Rivers. 



Family VIVIPARID.^. 

 YiViPARA, Lamarck. 



intertexta, f .Papillion and Nemeha Rivers. Rare. 



siihpurpiirea, Say. — Nemelia and Blue Rivers. 

 co7itcctoides, W. G. B. — Nemeha River. 

 Melantho, Bowditch. 



ponderosa, Saj^ — Elkhorn and Blue Rivers. Rai'e. 

 decisa, Say. — All the streams of Nebraska. 



decisa var. integra, \Y. G. B. — All the streams of Nebraska. No 

 clear line of demarkation between decisa and Integra in Nebraska 

 waters. 



