EXPLANATION OF PLATE 42 

 Figures approximately natural size. 



Fig. la. Scldsaster cordiformis Kew, n. sp. Holotype, specimen 11388, Univ. 

 Calif. Coll. Invert. Pal. Upper surface of test. South side Mount Diablo, Contra 

 Costa County, Calif., Univ. Calif, loc. 1743. Martinez group, Lower Eocene. 



Fig. 1&. Schizastcr cordiformis Kew, n. sp. Same specimen. Lower surface 

 of test. 



Fig. If. Schizasier cordiformis Kew, n. sp. Same specimen. Lateral surface 

 of test. 



Fig. Id. Schizaster cordiformis Kew, n. sp. Same specimen. Posterior sur- 

 face of test. 



Fig. 2a. Schizaster viartinezcnsis Kew, n. sp. Holotype, specimen 11342, 

 Univ. Calif. Coll. Invert. Pal. Upper surface of test. Muir Station, from coral 

 reef near Swett's Ranch, Contra Costa County, Calif., Univ. Calif, loe. 241. Mar- 

 tinez group. Lower Eocene. 



Fig. 2b. Schizasier viartinezcnsis Kew, n. sp. Same specimen. Lower surface 

 of test. 



Fig. 2c. Schizaster martinezensis Kew, n. sp. Same specimen. Posterior 

 surface of test. 



Fig. 2d. Schizaster martinezensis Kew, n. sp. Same specimen. Lateral sur- 

 face of test. 



Fig. 3a.. Schizaster stalderl "Weaver. Holotype, specimen 11019, Univ. Calif. 

 Coll. Invert. Pal. Upper surface of test. Humboldt County, Calif. Wildcat 

 series, Upper Pliocene. 



Fig. 3&. Schizaster stalderi Weaver. Same specimen. Lateral surface of test. 



Fig. 3c. Schizaster stalderi Weaver. Same specimen. Posterior surface of 

 test. 



Fig. 3d. Schizaster stalderl Weaver. Same specimen. Lower surface of test. 



Fig. 4a. Spatangus pacheeoensis Pack. Topotype, specimen 11020, Univ. 

 Calif. Coll. Invert. Pal. Upj)er surface of test. Vine Hill Station, Contra Costa 

 County, Calif. Tejon group. Upper Eocene. 



Fig. -ib. Spatangus pacheeoensis Pack. Same specimen. Lower surface of 

 test. 



Fig. 4c. Spatangus pacheeoensis Pack. Same specimen. Posterior surface 

 of test. 



Fig. -id. Spatangus pacheeoensis Pack. Same specimen. Lateral surface of 

 test. 



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