^2 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



Named in honor of Mr. J. R. Pemberton, who directed the 

 work of the Stanford geological party during the summer of 

 1910. 



Inoceramus whitneyi Gabb 

 PI. 8, Fig. 9 



Inoceramus whitneyi Gabb, Geol. Surv. of Gal., Pal., vol. 

 2, p. 193, pi. 32, fig. 91. 



The shell figured is medium in size, and subelliptical ; beak 

 broken, but is anterior and was, no doubt, prominent ; cardinal 

 margin straight and makes a sharp curve with the broadly 

 rounded posterior margin, which is continuous with the basal 

 and anterior margins ; surface marked by prominent, smooth, 

 concentric ribs which are more widely spaced towards the 

 margins; shell pearly. Found at locality 3, L. S. J. U. Pal. 

 Goll. 



Isocardia chicoensis, new species 

 PI. 8, Fig. 3 



Shell thick, robust, equivalve; margins circular in outline; 

 beaks prominent, approximate, and turned forwards; hinge- 

 line smooth; surface marked by coarse concentric lines of 

 growth, covering minute radial ribs which are seen on worn 

 parts of the shell. Locality 2, L. S. J. U. Pal. Coll. 



Lysis suciensis Whiteaves 



L. suciensis Whiteaves, Geol. Surv. Canada, vol. 1. pt. 5, 

 p. 367, pi. 45, fig. 3. 



The single specimen found is partially a cast, so any ex- 

 ternal sculpture has been lost. In form, spire, smooth sur- 

 face, and inner lip, the specimen is very close to Whiteaves's 

 species. The specimen is too poor to figure. Locality 2, L. 

 S. J. U. Pal. Coll. 



Macrocallista cordata, new species 



PI. 8, Fig. 1 



Shell cordate, thick, flattened, much longer than high; an- 

 terior margin broadly rounded, about same as posterior car- 



