TERTIARY FOSSILS. 51 



lated, sides flattened, upper surface sloping; suture distinct, im 

 pressed. Surface ornamented by about a dozen small angular 

 nodes on the upper angle of the whorl, from which faint longi 

 tudinal ribs descend over the body, becoming obsolete about the 

 middle; above similar ribs continue to near the suture; on the 

 earlier whorls these ribs are proportionately much larger; cross 

 ing these are three or four elevated revolving striae above the 

 angle, and about twenty below ; these alternate pretty regularly 

 in size, eleven or twelve of them being large, the others much 

 smaller; lines of growth faint in the middle, more distinct 

 towards the two ends of the body volution. Aperture moderate 

 in size, broadest in the middle ; outer lip simple ; inner lip rather * 

 heavily incrusted, bearing two strong, rather distant folds. 



Length, 2.3 inch ; width, 1.2 inch ; length of aperture, 1.3 inch ; width, .55 inch. 

 From the Pliocene of San Fernando Pass. Coll. by Mr. Frank Brown a single 

 specimen. 



TROCHITA. Schum. 



T. INORNATA, n. 8. 

 PI. 14, Fig. 8, 8 a. 



SHELL low, irregular, slightly oblique, nearly circular; volu 

 tions about two to two and a half; suture linear, indistinct; surface 

 entirely without ornament, bearing only a few lines of growth; 

 margin of internal plate sinuous. 



Diameter, 1.1 inch; height, .6 inch. 



From the Upper Miocene, near Half Moon Bay. 



ACJVLEA, Esch. 

 A. RUDIS, n. s. 



PI. 14, Fig. 9, 9 a. 



SHELL moderately large, subelliptical, outline slightly undu 

 lated, not distinctly emarginate ; apex subcentral, prominent, 



