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



It appears that Gabb was mistaken concerning "the only- 

 species with the pecuHar surface ornamentation," as the indi- 

 viduals figured as figures 3a and 3b on Plate 3 show. These 

 forms are very close to Conrad's figure of M. uvasana, and 

 the writer believes that the forms illustrated are cotypes of 

 Conrad's species. All of the four specimens figured as 2a, 2b, 

 3a, 3b came from Cal. Acad. Sci. locality 244. On this ac- 

 count the writer proposes a new name for the species rede- 

 scribed by Gabb as M. uvasana. 



Macrocallista vaderensis, new species 

 Plate 3, figures 5a, 5b, 5c 



Shell trigonal, with beak a third of shell length from broadly 

 rounded anterior end; posterior dorsal margin sloping to a 

 sharply pointed posterior ; broadly rounded anterior extending 

 from beak to nearly straight ventral margin ; lunule and es- 

 cutcheon, indistinct. The trigonal form of this species makes 

 it easily distinguishable from other Eocene Veneridse. 



Dimensions : — Height, 19mm. ; length, 26mm. ; convexity, 

 7mm. 



Type : — No. 267, and cotype No. 268, Cal. Acad. Sci. Lo- 

 cality 183, in the west bank of the Cowlitz River about one and 

 three-fourths miles southeast of Vader, Washington. Coll., 

 Bruce Martin. 



Named for its occurrence near Vader, Washington. 



Macrocallista (?) andersoni, new species 

 Plate 4, figures la, lb 



Shell elliptical in outline ; medium size ; beak prominent, a 

 third of shell length from anterior end ; posterior dorsal mar- 

 gin nearly straight ; posterior end subtruncate ; anterior end 

 well rounded ; lunule and escutcheon distinct ; a well marked 

 shallow umbonal groove extending to the ventral margin near 

 posterior end; hinge characters unknown; numerous lines of 

 growth decorating shell. The umbonal groove is the unique 

 character of this species and serves to distinguish it from other 

 west coast venerid forms. 



Dimensions : — Length. 39mm. ; height, 25mm. 



