492 University of California Publications in Geology [Vol. 8 



longitudinal ribs which tend to become obsolete on the body whorl, 

 and sometimes almost, if not entirely, obsolete on the anterior whorls 

 of the spire. Base of body whorl rounded ; outer lip sharp ; inner lip 

 smooth ; mouth ovate with a fairly strong' emargination anteriorly. 



Dimensions. — Type specimen : height, about 19 mm. ; greatest width 

 of body whorl, about 7 mm. 



Occurrence. — A very common species in the Upper San Pablo 

 Group, University of California localities 1617, 1207, 1081, etc. 



BUKSA TRAMP ASENSIS, n. sp. 

 Plate 67, figure 3 



Shell large, solid with six or seven regularly convex whorls, on each 

 of which there are two fairly prominent rope-like, discontinuous 

 varices. Surface of shell sculptured by fairly heavy, rounded, nodose 

 longitudinal ribs, the interspaces between which are somewhat wider 

 than the ribs. On the body whorl between the two varices, there are 

 sixteen of these longitudinal ribs. Surface also sculptured by medium 

 fine, revolving ribs, which on the type specimen are rather indistinct. 

 Sutures deeply impressed, the whorls being quite strongly and nodosely 

 carinate next to the suture ; this carinate effect is produced more 

 strongly because of the fact that on each whorl a fairly distinct groove 

 or sulcus encircles it just below the suture. Mouth and canal unknown. 



Dimensions. — Greatest width of body whorl about 41 mm. ; height 

 of spire, about 25 mm. 



Occurrence. — A single specimen of this species was found in beds 

 of the Lower San Pablo Group on Las Trampas Ridge, University of 

 California locality 1251. 



COLUMBELLA (ASTYEIS) KIRKENSIS, n. sp. 

 Plate 69, figure 8 



Shell small, narrow; spire high; whorls six or seven; sutures dis- 

 tinctly impressed. Whorls of spire very slightly convex. Just below 

 the suture on the body whorl there is sometimes a distinct shoulder 

 similar to that seen on C. gausapata var. carinata Hinds, a Recent 

 West Coast form. Surface smooth except for a few spiral lines on 

 anterior part of body whorl. Outer lip sharp ; interior of outer lip not 

 exposed ; inner lip smooth, not incrusted, with small oblique groove on 

 columella, 



