10 PALAEONTOLOGY OF CALIFORNIA 



Figure, natural size. 



Locality and position: From the Miocene, south of Martinez. Collected by Dr. 

 Fish, of Martinez, and Mr. Mathewson. 



This shell has few tangible characters except the high, acute spire, and the 

 general outline. The small mouth will at once distinguish it from Olivella bipli- 

 cata, and its size, from 0. Pcdroana (bcctica of Carpenter). 



COLUMBELLA, Lam. 



S. G. Alia, H. and A. Ad. 



C. (A.) RlCHTHOFENI, II. 8. 

 PI. 2, Fig. 1G. 



Shell elongated, slender, sub fusiform ; spire high; whorls five 

 and a half to six, slightly convex on the sides; suture deep. 

 Surface smooth, or marked only by irregular, stray lines of 

 growth, except on the anterior part, where there are a few ob- 

 lique revolving lines. Aperture subquadrate; inner lip incrusted 

 and bearing a few linear folds or teeth anteriorly ; outer lip thick- 

 ened and crenulate within; canal narrow and slightly curved. 



Figure, magnified; length of largest specimen about .5 inch. 



Localities and position: From the Pliocene, on the Russian River, collected by 

 Baron F. Von Richthofen, and from the same formation in San Francisco County, 

 in the bluffs on the coast, by M. Remond. 



NEVERITA, Risso. 



N". callosa, n. s. 



PI. 2, Fig. 17, 17 a, 17 b. 



Shell obliquely subglobose, compact; spire very small; whorls 

 four and a half, almost completely hidden; suture sharp; body 

 whorl broadly convex. Aperture narrow, very oblique, acute 

 behind, round in advance; outer lip simple; inner lip covered by 

 an unusually heavy callus which covers the umbilicus, is emav- 



