EXPLANATION OF PLATE 5 



Fig. 1. Yeniis brioniana, n. sp. X 1. Eight valve. Type. — No. 12377, Univ. 

 Calif. Mus. Pal., loc. 177. Briones. 



Fig. 2fl. Antigona willisi, n. sp. X 1. Dorsal view. Type. — No. 12379, 

 Univ. Calif. Mus. Pal., loc. 146. Briones. 



Fig. 2b. Antigona willisi, n. sp. X 1. Eight valve of type. 



Fig. 3. Cardium corbis (Martin), n.var.? X 1. Left valve. Specimen 

 figured is no. 12376, Univ. Calif. Mus. Pal., loc. 207. Briones. 



[168] 



