TERTIARY FOSSILS. 13 



Figure, magnified. Length about .35 inch. 



Locality: From a Post-Pliocene Marl, Santa Barbara Collected by Dr. A. L. 

 Heermann and others. 



MELANIA, Lam. 

 M. Taylori, n. s. 



PI. 2, Fig. 21. 



Shell slender, elongate, inany-whorled; whorls about twelve, 

 flattened on the sides; suture impressed. Surface marked by 

 three or four sharp revolving ribs, crossed by numerous curved 

 longitudinal ribs, forming a prominent flattened tubercle at each 

 intersection ; there are about twenty-five of these longitudinal 

 ribs to each volution; under side of the bodv whorl ornamented 

 by four or five sharp revolving ribs. Aperture suboval; pro- 

 duced in advance; inner lip incrusted; outer lip simple. 



Figure, natural size. 



Locality : From a fresh-water Tertiary deposit on Snake River, Idaho Territory, 

 on the road from Fort Boise to the Owyhee mining country. Collected by Mr. 

 A. Taylor. 



LITHASIA, Lea. 



L. ANTIQUA, 11. S. 

 PI. 2, Fig. 22. 



Shell subglobose; spire moderately elevated; whorls five, 

 rounded; suture strongly impressed. Surface smooth. Aper- 

 ture oblique, suboval, subacute above, rounded and slightly 

 expanded below; outer lip simple; inner lip heavily incrusted. 

 Umbilical region flattened, bordered by an angular carina, and 

 covered by an expansion of the inner lip. 



Figure, slightly magnified. 



Locality: With the preceding. Associated with these two shells is a little 

 bivalve, perhaps a species of Sphcerium, not in a sufficiently good state of preser- 

 vation for description. 



