EXPLANATION OF PLATE 18 



Figures approximately natural size. 



Fig. 1. Astrodapsis grandis Kew, n. sp. Cotype, specimen 11047, Univ. Calif. 

 Coll. Invert. Pal. Lower surface of test. North of Coalinga, Fresno County, 

 Calif., Univ. Calif, loe. 2268. Upper San Pablo group (Santa Margarita forma- 

 tion)-. Upper Miocene. 



Fig. 2. Astrodapsis calif ornicus Kew, n. sp. Holotype, specimen 11354, Univ. 

 Calif. Coll. Invert. Pal. Upper surface of test. North of Coalinga, Fresno County, 

 Calif., Univ. Calif, loc. 3077, Upper San Pablo group (Santa Margarita), Upper 

 Miocene. 



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