1916] 



Dickerson: Tejon Eocene of California 



499 



SURCULA CLARKI Dickerson 



Plate 41, figures la, lb 



Surcula clarki Dickerson, "Fauna of the Eocene at Marysville Buttes, 

 California," Univ. Calif. Publ. Bull. Dept. Geol., vol. 7, p. 278, 1913. 



A series of specimens found in the Tejon of Oroville South Table 

 Mountain shows a variation in form as the above-mentioned species 

 grows in size. The shouldering of the large specimens is far more 

 prominent than in the type and the surface between the shoulder and 

 suture of the larger whorls is distinctly concave. 



SURCULA GESTERI, n. sp. 

 Plate 42, figure 4 



Shell spindle-shaped with eight whorls ; the three nuclear whorls 

 the smooth ; the other whorls of the spire are decorated by two 

 rows of rounded nodes made by the crossing of about sixteen axial 

 ribs and two strong spiral lines. The upper row of nodes is slightly 

 larger and they mark the shoulder of the whorl. The space between 

 the shoulder and the appressed suture is concave and marked only 

 by spiral lines. The body-whorl has a similar set of axial ribs 

 crossed by six subequal spiral lines in its upper half and by about 

 six spiral threads which alternate in size on its lower half. Sinuous 

 growth lines characteristic of this genus mark the space above the 

 shoulder. The sinus is also found on the thin outer lip of some 

 specimens. Mouth elongate-oval ; inner lip slightly incrusted. 



Its double row of rounded nodes will serve to distinguish it at 

 once from other members of this genus which have thus far been 

 described from the Tejon group. The older specimens are some- 

 what more elongate than younger ones and body whorl is not so 

 wide. 



Named in honor of Mr. Clarke Gester. 



Dimensions. — Length, 9 mm. ; width of body-whorl, 3 mm. 

 Occurrence. — This species was found at University of California 

 Locality 672. 



TURRIS STOCKI, n. sp. 

 Plate 42, figure 5 



Shell spindle-shaped with nine or ten whorls; the first two or 

 three whorls of the type specimen are missing. The spire-whorls 

 are decorated by a nodose spiral line in the center of each whorl. 

 Separated from this central line by a wide space are two closely 



