Vol. V] DICKERSON— FAUNA OF THE TYPE TEJON 67 



spiral lines which are found in the slight concavity of the body- 

 whorl just below the suture; siphonal fasciole of two sharp 

 ridges with smooth channel between ; aperture semioval ; outer 

 lip thin, sharp ; inner lip covered by a thin callus. 



This species lacks the sharp axial ribs of Molopophorus 

 striata (Gabb) but its spiral decoration is more pronounced. 

 (See Plate 8, figure 3c for comparison.) Only one specimen 

 of M. striata was found and that one is evidently immature. 

 If more comparative material were available possibly it might 

 be shown that M. tejonensis is merely a mature form of M. 

 striata, but it was thought best to describe M. tejonensis as a 

 new species as its characters are markedly different. 



Dimensions : — Length, 20 mm. ; width of body-whorl, 1 1 

 mm. 



Type: — No. 320, Cal. Acad. Sci. Locality 245, along the 

 east bank of a small gulch about one-fourth of a mile east of 

 the pumping plant at the mouth of Grapevine Canyon, about 

 35 miles south of Bakersfield, California. Col., Bruce Martin. 



Named for its occurrence in the Tejon group at its type 

 locality. 



Hemifusus sopenahensis Weaver 



Hemifustis sopenahensis Weaver, C. E., Wash. Geol. Surv. 

 Bull. 15, p. 44, 1912. 



Plate 8, figures 2a, 2b 



The young individuals of this species have characters like 

 the genus Nyctilochus. The body-whorl in mature fornis is 

 more elongate and the axial ribbing less pronounced. 



Hemifusus volutaeformis, new species 

 Plate 8, figures 4a, 4b 



Shell small, solid, with five or six distinctly angulated whorls ; 

 whorls of the spire decorated by thirteen or fourteen axial 

 ribs and by equally spaced spiral lines. The shoulder of the 

 penultimate whorl which is well preserved located at a point 

 two-fifths the whorl-length below the suture ; the slope between 

 the appressed suture and the shoulder concave and covered by 

 spiral lines; the body-whorl decorated similarly to the spire- 



