502 University of California Publications in Geology [Vol. 9 



confused in the following respects : its apical angle is smaller ; its 

 whorls are flat and not angulated distinctly near the suture and 

 it is smaller. 



It may be identical with T. conica Weaver but the type of this 

 last species is such a poor one that this point can not be decided. 



A spirally ribbed form which is apparently an individual varia- 

 tion is found associated with the typical form described above. This 

 form is also figured. (See figure 9b.) 



Named in honor of Mr. F. M. Anderson, curator of the Depart- 

 ment of Palaeontology, California Academy of Sciences, who first 

 studied the fauna from the type locality of this species. 



Dimensions: — Length of broken type, 28 mm.; width of last 

 whorl on type, 8 mm. 



Occurrence: — The type specimen was obtained from University 

 of California Locality 1817, lower Tejon of Fresno County, where 

 it is very abundant. Collectors, Clarke Gester and R. E. Dickerson. 

 It is also found at University of California Locality 1428, which 

 is about fifteen hundred feet above the base of the Tejon south of- 

 Mount Diablo. 



TURRITELLA LAWSONI, n. sp. 

 Plate 42, figure 10 



Shell elongate conic ; number of whorls unknown ; suture linear, 

 impressed ; whorl slightly concave with center of concavity below 

 middle ; lower fourth of whorl flat with surface parallel to axis ; 

 base of whorl, nearly flat, overhanging succeeding whorl, making an 

 acute angle with axis of shell ; decoration consisting of numerous 

 fine threads of variable strength. 



Dimensions: — Height, 36 mm. 



Occurrence: — Tejon group. Section 24, Domengine Ranch. Coll. 

 F. M. Anderson, University of California Locality 2295. 



XENOPHORA STOCKI, n. sp. 

 Plate 37, figures 4a, 4b 



Shell, low trochiform with six whorls ; shell substance thin. 

 Whorls are medially shouldered, with steep slope from a wavy, linear 

 suture to the shoulder. The space between the shoulder and the next 

 whorl is parallel to the axis of the shell. This space is further dec- 

 orated by about seven roughened nodes whose apices are at the 

 shoulder. The shell surface is pitted in several places. These round 



