35 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4Th. Si.r. 



Polynices hornii (Gabb) 

 PI. 13, Fig. 4 



Lunatia hornii Gabb. Pal. Cal, vol. 1, p. 106, pi. 29, fig. 217. 



Shell moderate in size, subglobose; spire small, acute, not 

 prominent; whorls five, almost entirely enveloped; aperture 

 semilunar, rounded below; outer lip acute; columellar lip with 

 a moderately large callus, thickened above, smaller and flat 

 below, containing as a thickened lip almost to the anterior end 

 of the mouth. Umbilicus small and partially covered. Sur- 

 face marked by irregular lines of growth. Locality 4, L. S. J. 

 U. Pal. Coll. 



This species occurs also in the Tejon formation. 



Pseudoliva howardi (Dickerson) 

 PI. 12, Figs. 4 and 9 



P. reticulata Waring, Jour. Geol., vol. 22, no. 8, p. 783, 

 Nov.-Dec, 1914. 



Molopophoriis {f) howardi Dickerson, Bull. Dept. Geol. 

 Univ. of Calif., vol. 8, no. 15, p. 301, pi. 29, figs. 3a and 3b. 

 Dec, 1914. 



Shell subconical; whorls four, spire low, suture linear; inner 

 whorls almost covered by body whorl, which is concave ; aper- 

 ture wide, posterior angular; anterior produced slightly into a 

 canal; outer lip simple, inner lip incrusted and marked by a 

 fold revolving from end of canal around to inner lip, repre- 

 senting former positions of end of canal; surface ornamented 

 by longitudinal folds and spiral ribs; where these intersect, 

 small tubercles develop ; middle of body-whorl impressed by a 

 single revolving line which forms a tooth where it is truncated 

 on the outer lip. Locality 4, L. S. J. U. Pal. Coll. 



Sinum dickersoni, new species 

 PI. 14, Fig. 10 



Shell thin, depressed, auriform; spire small; whorls five, 

 rapidly increasing in size ; suture deep ; upper part of the whorls 



