1916J 



Dickerson: Tejon Eocene of California 



491 



suture over three- fourths of its length. The sinus is shallow and 

 slightly above the shoulder. Aperture elongate-oval ; canal long, 

 slender, straight. 



This species differs from D. ullreyana Cooper in its greater 

 length, in its more elongate and less nodose, transverse ribs which are 

 more numerous than those of D. ullreyana. 



Dimensions. — Length, 7.5 mm. ; diameter, 2.5 mm. 



Occurrence. — University of California Locality 2225, south side of 

 Oroville South Table Mountain, Butte County, California. 



DRILLIA COOPERI, n. sp. 

 Plate 40, figures 6a, 6b 



Shell spindle-shaped with ten slightly convex whorls ; the first two 

 nuclear whorls are smooth and slightly more convex than the rest. 

 The third and fourth whorls have a slight angulation just above a 

 linear impressed suture. The last eight whorls are decorated by five 

 spiral threads or bands crossed by growth lines characteristic of this 

 genus. The band just below the suture is flat and slightly wider than 

 the next three. The three or four threads below the suture on 

 the last five whorls are stronger than the rest. The body-whorl and 

 canal are together nearly twice as long as the spire. The mouth is 

 oval and narrows gradually into a long nearly straight canal ; outer 

 lip smooth ; inner lip with a very slight callus. 



This species can be readily distinguished from the other west coast 

 Eocene forms of the genus Drillia by its nearly smooth whorls. 



Named in honor of Dr. J. G. Cooper, who first described species 

 from this vicinity. 



Dimensions. — Length of broken specimen, 20 mm. ; length of spire, 

 9 mm. ; width of body-whorl, 8 mm. 



Occurrence. — University of California Localities 785, 1853 ; type 

 specimen from latter locality. 



EPITONIUM TEJONENSIS, n. sp. 

 Plate 38, figure 4 



Shell elongate, only moderately slender, whorls nine, the first 

 two being smooth ; mouth round ; whorls convex and decorated by 

 spiral lines and by varices, the latter being the more pronounced. The 

 body-whorl has about twenty-five varices which run almost to the 

 linear suture. These varices are slightly swollen in the middle of 



