1922] Fauna from the Eocene of Washington 11 



Occurrence. At locality 329 (University of Washington Palaeontological 

 Collection) bend of the Cowlitz River, near Vader, Lewis County, Section 28, 

 Township 11 North, Range 2 West. 



GlyYCYMERIS CRESCSNTENSIS n. Sp. 



Plate VIII, Figures 10, 12 



Description. Shell small, subquadrate ; anterior end straight and inclined 

 downward at an approximate angle of 45 from the dorsal margin to a point 

 about one-half of the height of the shell, the remaining portion curving regularly 

 into the ventral margin; posterior end rounded; surface delicately ornamented; 

 the anterior portion with seven very wide radiating ribs obliquely sloping toward 

 the anterior end, and which on the extreme anterior region decrease in size; 

 when the shell is held with the anterior end directed toward the eye, the peculiar 

 slope of the ridges causes the high point of each rib to appear as a very narrow 

 rib, with a wide interspace about three times the width of the rib ; the ornamen- 

 tation on the posterior portion is composed of narrow, rounded, radiating ribs 

 with interspaces of nearly equal width. The entire surface is also sculptured 

 by numerous fine, concentric lines which give the ribs a microscopic, crenulated 

 appearance. 



Dimensions. Length 10 mm. ; height 9 mm. ; width 6 mm. 



Occurrence. At locality 358 (University of Washington Palaeontological 

 Collection) at Joice station, one-fourth of a mile east of Tongue Point, Port 

 Crescent, Clallam County, Section 22, Township 31 North, Range 8 West. 



GlvYCYMCRIS KEXSOENSIS n. Sp. 



Plate VIII, Figure 2 



Description. Shell large and subquadrate; umbones large; cardinal area 

 very narrow; hinge line straight; beaks situated near the mid-line of the shell; 

 anterior dorsal margin abruptly rounded; anterior end straight rounding into 

 the ventral margin; ventral margin curved to the posterior end; posterior end 

 straight, oblique; posterior umbonal slope more convex than the anterior slope 

 which flares out to the anterior margin ; a slight flexure occurs at the posterior 

 dorsal end; shell very convex; surface ornamented with 33 very flat, wide, 

 radiating ribs with very narrow interspaces. 



This species is like G. veatchii Gabb var. major Stanton but differs from that 

 species in the straighter dorsal line, in a greater production of the anterior end 

 dorsally and in the less pronounced character of the posterior flexure. 



