THE NAUTILUS. 



107 



Characterized by its tabulated whorls, well elevated spire, and 

 very narrow umbilicus, sutures moderately deep; lip slightly diag- 

 onal, usually angular below. Shell smooth, pellucid. 



This species is known only from near the type locality. It re- 

 minds one of V. piscinalis of Europe. 



Utah. 



* Lehi, Utah Lake, near head of Jordan River (Call). 



Fossil : Semifossil, Bonneville Basin, Utah (Call.) 



Valvata calli n. sp. 



Valvata virens Call, Bull. 11, U. S. Geol. Sur., 1884, p. 21 (in 

 part). 



Shell varying from a high spire as in V. virens to a very low spire 

 as in V.lewisii; sculpture, smooth, carinate tricarinate or marked 

 by numerous spiral striae. Umbilicus rather narrow; whorls rounded 

 in smooth or striate forms angular in carinate forms. Sutures deeply 

 impressed in high forms, slightly in low. Type tricarinate with 

 moderately elevated spire. 



Measurements : Type, alt. 4.5 mm., diam. 5.5 mm., diam. of 

 aperture 2 mux.; flnttened specimen, alt. 4 mm., diam. 6 mm., diam. 

 of aperture 2 mm., Marl, Upper Lahontan Quarternary, near Sum- 

 mer Lake, Ore. (F. M. Anderson). 



Also from " Central Nevada, near R. R.," named in honor of the 

 late Robert Ellsworth Call. 



Valvata avhitei n. sp. 



Spire depressed, barely raised above outer whorl, broadly umbili- 

 cate two whorls visible beneath; shell rather thick, smooth, marked 

 by very faint growth lines; sutures very slightly impressed, whorls 

 round. 



Measurements: Alt. 2.5 mm. ,^ diam. 6 mm., diam. of aperture 2.5 

 mm.. Marl., Upper Lahontan, Quarternary, near Summer Lake, 

 Oregon (F. M. Anderson). 



This species resembles a very large specimen of V. humeralis, but 

 the umbilicus is much broader in specimens of a corresponding size. 

 The species also has a much thicker shell. 



Named in honor of the late Dr. C. A. White. 



Stanford University, Cal. 



