EXPLANATION OF PLATE 25 



Fig. la. Trigonarca excavata, n. sp. Exterior of right valve. 

 Fig. lb. Trigonarca excavata, u. sp. Interior of right valve. 



Figs, la, lb, type no. 12315, loe. 2141. 

 Fig. 2a. Trigonarca californica, n. sp. Interior of left valve. 

 Fig. 2b. Trigonarca californica, n. sp. Exterior of left valve. 



Figs. 2a, 26, type no. 12313, loc. 2141. 

 Fig. 3. Cucullaea lirata, n. sp. Left valve of type no. 12314, loc. 2149. 

 All figures approximately natural size. 



[436] 



