482 University of California Publications in Geology ["Vol. 8 



below. Peristome subquadrate; shell pseudo-umbilicate and with 

 fairly heavy callus just posterior to peristome. 



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

 of body whorl, 16 mm. 



Occurrence. — University of California locality 1182; found asso- 

 ciated with Tivela gabbi, Bittium trampasensis, Astralium raymondi, 

 etc. 



CALLIOSTOMA SPLENDENS Cpr. var. DIABLOENSIS, n. var. 

 Plate 65, figure 21 



Shell conical, medium in size ; spire moderately high ; whorls seven, 

 angulated a little posterior to middle, with the surface between the 

 angulation and the suture subtabulate, and slightly sloping. Sutures 

 impressed ; base of body whorl nearly flat ; sides of whorls nearly flat ; 

 junction between side of body whorl and base subangulate. Surface 

 of whorls sculptured by medium line, nodose or beaded, revolving ribs, 

 with interspaces wider than the tops of the ribs; between the angula- 

 tion of the whorl and the suture there are two revolving ribs with 

 riblets in the interspaces : on the sides of the body whorl there are 

 five revolving ribs, usually with a finer revolving, unnodose riblet 

 between. On the base of the body whorl there are seven revolving ribs 

 similar to those on the side — here also a faint interriblet may be seen. 

 On the sides of the whorls of the spire there are three revolving ribs. 

 Mouth subquadrate ; shell imperforate. 



This variety differs from the species C. splendens Carpenter, a 

 Recent species, in having the whorls more strongly angulated and 

 tabulated ; the ribbing and nodes are slightly coarser, the interspaces 

 between the ribs being greater and there are fewer revolving ribs 

 between the angulation of the whorls and sutures. 



Dimensions. — Height of shell, 10 mm.; greatest width of shell, 

 10 mm. 



Occurrence. — In the Middle and Upper San Pablo Group of Kirker 

 Pass, also from the Upper San Pablo Series to the southeast of Walnut 

 Creek, University of California localities 102, 350 and 1890. 



TEGTJLA (CHLORASTOMA) DANVILLENSIS, n. sp. 

 Plate 65, figures 17 and 18 



Shell depressed, conical, fairly heavy; apex broken on type speci- 

 men. Number of whorls five, possibly six. Sutures depressed; sides 

 of whorls nearly flat, the upper part of the whorl being subtabulate ; 



