Vol. IV] ANDERSON AND MARTIN— NEOCENE RECORD 91 



axial ribbing more pronounced and of a different character, 

 and the shell broader in proportion to the altitude. 

 Named in honor of Mr. W. H. Ochsner. 



Drillia wilsoni, new species 



Plate 6, figures 10a, 10b, and 10c. 



Shell large for the genus, elongated, solid, with eight or 

 nine whorls; spire elevated; whorls sharply angulated at the 

 middle, very concave above, flat or slightly convex above, 

 crossed by ten rounded, oblique axial ridges rising to prominent 

 nodes on the angles, becoming fainter or disappearing imme- 

 diately above ; the axial ridges crossed by spiral cords separated 

 by grooved interspaces in front of the shoulder on each whorl, 

 four or five on the penultimate whorl, and eighteen or twenty 

 on the last whorl ; aperture ovate ; columella smooth, straight ; 

 canal moderately long, nearly straight. 



Dimensions : — Altitude of the type, with defective apex, 47 

 mm. ; diameter of the last whorl, 18 mm. ; length of the aper- 

 ture, including the canal, 23 mm. 



Type: — No. 218, and cotypes Nos. 219, 220, Cal. Acad. Sci., 

 lower Miocene of eastern San Luis Obispo County, California, 

 locality 126, in the bed of a small creek near the center of Sec. 

 34, T. 28 S., R. 15 E. 



Drillia temblorensis, new species 

 Plate 7, figures Sa and 5b. 



Shell small, fusiform, with seven or eight whorls ; spire high 

 with an acute apex; whorls angulated a little in front of the 

 middle, flat above, convex below, sculptured with ten or eleven 

 fine spiral cords which are crossed by numerous lines of 

 growth ; six spiral cords above the angle and four below, two 

 of the latter slightly more prominent than those intervening; 

 suture distinct, channeled ; body-whorl with twenty-four spiral 

 cords, those near the shoulder most prominent ; aperture ellip- 

 tical, with a simple outer lip ; canal moderately short ; columella 

 smooth and twisted. 



