Vol. VII] DICKERSON— CLIMATE AND OLIGOCENE FAUNAS 167 



end and merging into the convex posterior ; dorsal line straight ; 

 seven sloping teeth on either side of six nearly vertical smaller 

 teeth which are centrally located on a strong, wide hinge plate. 



Dimensions: — Length, 27 mm. ; height, 26 mm. ; convexity, 

 of right valve of type, 8 mm. 



Type: — No. 383 and cotype 384, Cal. Acad. Sci. Locality 

 181, near Vader, Lewis County, Washington, on east bank of 

 the Cowlitz River just back of the Greeco ranch house, about 

 four miles east of Vader. Colls., F. M. Anderson and Bruce 

 Martin. 



Named in honor of Mr. F. M. Anderson, who collected the 

 type. 



Barbatia gabbi, new species 

 PI. 27, Fig. 4 



Shell small, with nearly straight hinge line; ventral margin 

 very broadly rounded; anterior end narrowly rounded; pos- 

 terior end rounded broadly, meeting the ventral margin at the 

 extremity of a rounded indefinite umbonal slope. 



This description is based upon a study of the growth lines of 

 the broken type and checked by a specimen from another local- 

 ity which shows a complete outline. 



Type: — No. 385, Cal. Acad. Sci. Locality 181, near Vader, 

 Lewis County, Washington, on east bank of the Cowlitz River, 

 just back of the Greeco ranch house, about four miles east of 

 Vader. Colls., F. M. Anderson and Bruce Martin. 



Cardita (Carditamera) weaveri, new species 

 PI. 27, Figs. Sa and Sb 



Shell elongate-quadrate, small; hinge plate heavy, typical; 

 rounded, radial beaded ribs cut by somewhat squamose incre- 

 mental ribs decorating the shell. 



Dimensions: — Length, 7.5 mm.; height, 5 mm. 



Type: — No. 386, cotype 387, Cal. Acad. Sci. Locality 181, 

 near Vader, Lewis County, Washington, on east bank of the 

 Cowlitz River, just back of the Greeco ranch house, about four 

 miles east of Vader. Colls., F. M. Anderson and Bruce Martin. 



Named for Dr. C. E. Weaver of the University of Wash- 

 ington. 



