EXPLANATION OF PLATE 41 



Figures approximately natural size. 



Fig. la. Hemiaster cholamen^is Kew, n. sp. Cotype, specimen 11338, Univ. 

 Calif. Coll. Invert. Pal. ITjjper surface of test. East side of Cliolame Valley, 

 Monterey County, Calif., Univ. Calif, loc. 31-11. Cretaceous ( f). 



Fig. 1&. Hemiaster olwlamensis Kew, n. sp. Cotype, specimen 11313, Univ. 

 Calif. Coll. Invert. Pal. Lower surface of test. Univ. Calif, loc. 3141. 



Fig. Ic. Hemiaster cholamensis Kew, n. sp. Specimen 11338. Posterior sur- 

 face of test. 



Fig. Id: Hemiaster choJamensis Kew, n. sp. Specimen 11338. Lateral surface 

 of test. 



Fig. 2a. Hemiaster oregonensis Kew, n. sp. Cotype, specimen 11040, Umv. 

 Calif. Coll. Invert. Pal. Upper surface of test. Jackson County, Oregon, Univ. 

 Calif, loc. S142. Cretaceous. 



Fig. 2ti. Hemiaster oregonensis Kew, n. sp. Cotype, specimen 11039, Univ. 

 Calif. Coll. Invert. Pal. Upper surface of tlie test of a crushed specimen. Univ. 

 Calif, loc. 3142. Cretaceous. 



Fig. 2c. Hemiaster oregonensis Kew, n. sp. Specimen 11039. Lower surface 

 of test. 



Fig. 2(7.. Hemiaster oregonensis Kew, u. sp. Specimen 11040. Lateral surface 

 of test. 



Fig. 3(i. Schizasier lecontei Merriam. Specimen 11341, Univ. Calif. Coll. 

 Invert. Pal. Upper surface of test. Near Vine Hill Station, Contra Costa 

 County, Calif. Martinez group. Lower Eocene. 



Fig. 3&. Schizaster lecontei Merriam. Same specimen. Lower surface of test. 



Fig. 3c. Sehisaster lecontei Merriam. Same specimen. Lateral surface of test. 



Fig. 3d. Schizaster lecontei Merriam. Same specimen. Posterior surface of 

 test. 



Fig. 4. Schisqster calif amicus (Weaver). Neotype, specimen 11259, Univ. 

 Calif. Coll. Invert. Pal. Upper surface of test. Appros. % nat. size. Bear Valley, 

 Contra Costa County, Calif., Univ. Calif, loe. 3055. Agasoma gravidum zone, 

 San Lorenzo series, Oligocene. 



Fig. 5a. Schizaster diabloensis Kew, n. sp. Holotype, specimen 11387, Univ. 

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

 Calif, loc. 1427. Meganos group. Middle Eocene. 



Fig. 51). Schizaster di-abloensis Kew, n. sp. Same specimen. Posterior sur- 

 face of test. 



Fig. 5c. Schizaster diabloensis Kew, n. sp. Same specimen. Lateral surface 

 of test. 



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