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University of California Publications in Geology [Vol. 8 



interspaces between these ribs are equal and about as wide as the tops 

 of the ribs; posteriorly there is a small sutural unnodose riblet. On 

 the whorls of the spire there are four of the heavy spiral ribs each 

 with an obscure, sutural riblet posteriorly. Base of body whorl 

 smooth, slightly convex. Peristome subquadrate in outline, faintly 

 emarginated anteriorly. Inner lip inerusted and slightly flattened. 

 Dimension. — Height, about 8 mm. 



Occurrence. — Upper San Pablo. University of California locality 

 118. 



CERITHIOPSIS TURNERI, n. sp. 

 Plate 65, figures 1 and 2 



Spire high, elongate, conical, with ten or eleven whorls ; sides of 

 whorls flat. Sutures deeply impressed. Body whorl angulate at 

 junction of sides with base. Sculpturing of macular whorl not pre- 

 served. Whorls of spire with four fairly prominent, revolving ribs 

 with a riblet on the lower part of each whorl just at the suture ; inter- 

 spaces between the ribs about equal in width to the ribs. Body whorl 

 with six revolving ribs, the two anterior ribs being the smaller and 

 situated at the angle between the base of the whorl and the sides. 

 Surface also sculptured by eighteen or nineteen longitudinal ribs, 

 which form prominent nodes at the junction with the revolving ribs ; 

 base of body whorl smooth, quite flat, slightly convex anteriorly. 

 Mouth subovate, rather strongly emarginated ; outer lip sharp ; colu- 

 mella short, smooth, slightly twisted. 



Named in honor of H. W. Turner, one of the first to make a syste- 

 matic study of the geology of the Mount Diablo region. 



Dimensions. — Type specimen : height, about 15 mm. ; greatest width 

 of body whorl, 4 mm. 



Occurrence. — In the Lower San Pablo group at Kirker Pass, Uni- 

 versity of California locality 100. 



CERITHIOPSIS BOLINGERENSIS, n. sp. 

 Plate 65, figure 25 



Shell small ; number of whorls, seven or eight, the sides of which 

 are only slightly convex with impressed sutures. Surface sculptured 

 by nineteen or twenty medium fine, longitudinal ribs, the interspaces 

 between which are about as wide as the tops of the ribs. Surface 

 also sculptured by medium fine spiral nodose ribbing. On the body 



