282 NORTH AMERICAN FAUNA. [No.7. 



below the sutures, the upper-lateral portion rather flattened, periphery 

 and base convex. Surface smooth, horn-colored. Aperture oblique, 

 ovate, angled above, broadly rounded below; upper portion of the inner 

 lip adherent to the body-whorl, lower portion arcuate, without a callous 

 thickening. 



"Alt. 3, diain. 2£ ram . 



" Collected from a warm spring (temperature 97° F.) in Pahranagat 

 Valley, Nevada, by Dr. 0. Hart Merriam, and submitted to the writer 

 by Br. R. E. C. Stearns. 



" This species differs from F.fusca Hald., in the much more distinct 

 umbilicus, thin texture, and the non-tkicJcened inner lip. 



" Specimens may be seen in the National Museum 

 (No. 123626) collected at Warm Springs, Pahrana- 

 gat Valley, Nevada, by Dr. C. Hart Merriam, May 

 25, 1891." 



This form, not previously described, is regarded 

 by Mr. Pilsbry, who is an authority on the shells 

 of this and allied groups, as a new species. It 

 was found associated with Tryonia clathrafa) else- 

 where noted, the temperature of the water being 



lug. 2. Flumiincolanier- „ 



• ■ 97° F 



Fluminicola fusca Hald. var. minor. 



Ash Meadows, Nye County, Nevada (Mus. No. 123624), F. .Stephens, Mr/rch 4, 1891. 



Numerous (200) living specimens of nearly uniform size in spring. 



Fluminicola nuttalliana * Lea. 

 .Shoshone Falls, Idaho (Mus. No. 58596). 



A large number of specimens, probably as many as two hundred and 

 fifty, were collected at this locality by Dr. Merriam (October 10, 1890), 

 who found them clinging to the rocks in the stream. They vary consider- 

 ably in elevation of the spire, etc., but the form of the mouth is quite 

 persistent. 



A dwarfed but characteristic aspect of this species occurs among the 

 surface shells in the Colorado Desert. 



Suborder SCVTIBRANCHIATA. 

 Section RuiroDOGLOSSA. 



Helicina chrysocheila Binney. 



Hidalgo, Tamaulipas, Mexico (Mus. No. 123627); also Texas near the mouth of the 

 Eio Grande (Mus. No. 123167), William Lloyd. 



Four characteristic illustrations of this well marked and handsome- 

 species described in Binney's Terr. Air-breathing Moll., U. S., Vol. 11, 

 p. 354, 1851. In addition to the above number, two were obtained at 

 the Texan locality. 



* Inadvertently omitted in my previous lrat, hut included in list published in N. 

 Am-. Fauna, No. 5, 1891, p. 27. 



