DAVENPORT ACADEMY OF NATURAL SCIENCES. 



Genus LIMNOPHYSA Fitzinger (1833). 

 Limnophysa bonnevillensis, sp. nov. 



(Plate I., Figs. 10-13.) 



Limnophysa bonnevillensis, Call. Bull. U. S. Geol. Sur., No. n, p. 48, Plate 

 VI., Figs. 10-13 (1884). 



Shell umbilicated, elongate, ventricose or bullate, somewhat solid, 

 faintly striate and very minutely reticulated below the suture, the last 

 whorl bearing faint longitudinal ridges or costae; spire elevated, acute; 

 suture deeply impressed; whorls 4 to 4^2, very much rounded, some- 

 times tending to geniculation above, the last whorl equal to three- 

 fourths the whole length of the shell, rapidly increasing in size, much 

 swollen, somewhat expanded at base; columella somewhat plicate, 

 slightly callous, regularly arcuate; columella and peristome continu- 

 ous; peristome simple, margins joined by a heavy callus, which is con- 

 tinuous and so reflexed as to partially close the umbilicus; aperture 

 broadly ovate, often patulous, equal to one-half the entire length of the 

 shell, oblique, angled slightly behind. 



Fossil, Quaternary. Bonneville Lake beds, Kelton, Utah. 



The four largest specimens of the many in the collections give the 

 following dimensions : 



STREPOMATID^E. 



Genus GONIOBASIS Lea (1862). 



Goniobasis stearnsiana, sp. nov. 



FIG. 3. 1 



GON. STEARNSIANA. 2 



Shell globose, not very elongate, 

 excavated in umbilical region, but not 

 umbilicated, usually coarsely and ob- 

 liquely costate on upper whorls; spire 

 conical, not much elevated; whorls 

 5/^-6^, scarcely convex, appressed 

 at the suture, body-whorl very large, 

 more than equalling one-half the en- 

 tire length, often angulate at periph- 



