156 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



Descriptions of New Species 



Leda merriami, new species 



PI. 27, Figs, la and lb 



Shell inflated, resembling Leda alceformis Gabb in general 

 shape; acutely rostrate, very inequilateral, very convex; beak 

 prominent, high; anterior slope convex, ascending; posterior 

 slope concave ; anterior end bluntly rounded ; base arcuate ; 

 escutcheon wide, nearly flat; incremental lines numerous, 

 rounded ; anterior teeth, 24 ; posterior teeth, 20 to 23 ; chondo- 

 phore sub-umbonal, not projecting. 



Dimensions: — Length, 30 mm. ; height, 22 mm, ; convexity, 

 4.5 mm. 



Type: — No. 381, 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 Dr. J. C. Merriam, Professor of Paleon- 

 tology, University of California, whose guidance and kindly 

 counsel have been a great inspiration to the writer. 



Area washingtoniana, new species 

 PI. 27, Figs. 2a and 2b 



Shell roughly rectangular; small with beautiful beaded radial 

 ribbing; anterior end straight, making right angles with 

 straight hinge line and nearly straight base ; posterior extrem- 

 ity, the pointed extension of a marked umbonal ridge which di- 

 vides the posterior half of the shell into a flat, alate right tri- 

 angle in its upper third; decoration consists of thirty to forty 

 subequal beaded ribs. 



Dimensions: — Length, 5 mm. 



Type:—^o. 382, 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. 



Glycimeris andersoni, new species 



PI. 27, Figs. 3a, 3b and 3c 



Shell inflated equivalve, nearly equilateral ; beaks small, base 

 arcuate, meeting straight, anterior slope medially at anterior 



