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



EXPLANATION OF PLATE 3 



Fig. la. Macrocallista conradiana (Gabb), X2. This species was de- 

 scribed as Tapes conradiana. It is a very common form throughout the 

 Tejon group of California. The figured specimen is from Cal. Acad. Sci. 

 LocaHty 244. 



Fig. lb. Macrocallista conradiana (Gabb), X2. Umbone view of speci- 

 men from Cal. Acad. Sci. Locality 244. 



Fig. Ic. Macrocallista conradiana Gabb, XI. Hinge view of large speci- 

 men from Locality 244. 



Fig. 2a. Meretrix tejonensis, n. nom., XI. 



Fig. 2b. Meretrix tejonensis, n. nom., X2. This species was identified 

 and redescribed by Gabb as Meretrix uvasana Conrad but he really had 

 not obtained Conrad's cotype. 



Fig. 3a. Meretrix uvasana Conrad, XI. Figured specimen is from 

 Cal. Acad. Sci. Locality 244. 



Fig. 3b. Meretrix uvasana Conrad, XI. 



Fig. 4. Meretrix ovalis Gabb, XI. From Cal. Acad. Sci. Locality 245. 



Fig. 5a. Macrocallista vaderensis, new species, XI. Type. From Cal. 

 Acad. Sci. Locality 183. 



Fig. 5b. Macrocallista vaderensis, new species, XI. View showing in- 

 terior of type specimen. 



Fig. Sc. Macrocallista vaderensis, new species, XI. View of interior of 

 a small left valve from Cal. Acad. Sci. Locality 183. 



