EXPLANATION OF PLATE 6 



Figure approximately natural size 



Fig. 1. Clypeaster howersi Weaver. Cotype, specimen 10060, Univ. Calif. 

 Coll. Invert. Pal. Lower surface of test. Coyote Mountain, Imperial County, 

 Calif., Univ. Calif, loc. 2064. Lower division of the Carrizo Creek beds. Pliocene. 



[164] 



