1922] Fauna from the Eocene of Washington 7 



ambones ; a faint groove extends from the beaks to the posterior point of the 

 ventral margin, just back of which the concentric sculpture is somewhat obliter- 

 ated except for faint lines of growth. 



This shell resembles somewhat the specimens which Dr. Dickerson has 

 pictured as L. gabbi, from California localities. (Proceedings of the California 

 Academy of Science, 1915, vol. V, No. 3, pi. 1, fig. 1 ; University of California 

 Publications in Geology, vol. 9, No. 17, pi. 36, fig. 3, 1916). Leda gabbi Conrad 

 as represented by Gabb (Geological Survey of California, 1864, vol. I, pi. 26, fig. 

 185 ; vol. II, p. 197) is less equilateral, the rostrum more pointed and the ribbing 

 finer than Leda cowlitsensis. 



Dimensions. Length 20 mm.; height 11 mm. (largest specimen). 



Occurrence. At locality 329 (University of Washington Palaeontological 

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

 Township 11 North, Range 2 West; type locality 343 (University of Washing- 

 ton Palaeontological Collection) on Coal Creek, Cowlitz County near Inman- 

 Polson Camp shops, Section 2, Township 8 North, Range 3 West. 



GENUS YOLDIA 



YOL,DIA DUPREI n. sp. 

 Plate X, Figures 2, 7 



Description. Shell small, plump, and subelongate in outline; inequilateral, 

 beaks situated not quite a third of the distance from the anterior end; ventral 

 and dorsal margins nearly parallel ; anterior dorsal margin sloping at about an 

 angle of 10 from the dorsal margin, rounded below into the ventral margin which 

 is only slightly rounded, posterior end extends upward at about an angle of 40 

 with the ventral margin, posterior terminating at the dorsal margin in a point; 

 posterior dorsal end concave; lunule faintly developed; escutcheon more deeply 

 impressed; surface smooth except for the concentric growth lines which are 

 fine and delicate; shell with a beautiful polish; outline of the teeth seen tnrough 

 the shell in the cardinal region. 



Named in honor of Dr. Warren Du Pre Smith, professor of Geology, Uni- 

 versity of Oregon. 



Dimensions. Length 14.5 mm. ; height 8 mm. ; width 6 mm. 



Occurrence. At locality 329 (University of Washington Palaeontological 

 Collection) at bend in Cowlitz River, near Vader, Lewis County, Section 28, 

 Township 11 North, Range 2 West. 



