Occasional Papers of the Miiseimi of Zoology 5 



5. Lymiuca paliistn's Aliill. — Pools in the l)e(l of and 

 aloiii;" the Iluniljoldt ]\ivcr and along' the rail-road track near 

 the river : Annie Creek ; irrigation ditches near the Mnmholdt 

 River and near Annie Creek and north of the ranch house. 

 Carlin : dry pond west of tunnel, Moleen Canyon. 



A'ery ahundant and exceedingly variable, but, as in the 

 case of the Physas, it is practically impossible to draw any 

 fixed lines between the varigus forms represented, and it would 

 seem best to refer them all to one species. 



6. Lyniiura cap era fa Say. — Very al)nndant in pools in 

 the l)ed of IIuml)oldt River. Apparently a well marked local 

 form characterized by the almost entire obsolescence of the 

 spiral sculpture. Many of the specimens are conspicuously 

 striped longitudinally. 



8. Lyumcca huiiiilis iiiodicclhi Say. — ^laggie Creek; bed 

 of diverted spring stream, Cortez Range ; marshy ponds near 

 the Humboldt River, and Woodruff Creek. 



9. LyiiiiKca daUi liaker var. — Spring in Cortez foot-hills ; 

 bed of diverted stream, Cortez Range, and Woodruff' Creek. 

 A considerable portion of the specimens of both this and the 

 preceding" species from Woodruff Creek are conspicuously 

 striped longitudinally. 



10. PJiysa auipullacca Gld. — Ponds by the rail-road track 

 and in the hed of and along the river and along" Susan Creek, 

 Annie Creek, and Maggie Creek ; oxbow pond in Maggie 

 Canyon ; mud-flat along the river, Humboldt Valley ; irrigation 

 ditch, Annie Creek ; spring in Cortez foot-hills, and diverted 

 spring" stream in Cortez Range. 



This species is by far the most common one in the collec- 

 tion. There is, as might be expected, a very considerable vari- 

 ation in size and several of the lots have only immature speci- 



