1920] Kew: Cretaceo^is and Cenozoic Echinoidea 111 



Holotype of small thick form, from San Pablo Bay-Mount Diablo 

 region (specimen no. 11006 Univ. Calif. Coll. Invert. Pal.) ; near town 

 of Santa Margarita, San Luis Obispo County, California ; Quailwater 

 Canyon, San Luis Obispo County, California (U. S. Geol. Surv., Calif. 

 Acad. Sci., and Univ. Calif, collections). 



ASTRODAPSIS WHITNEYI Kemond 

 Plate 16, figures la, Ih ; plate 17, figure 2 



Astrodapsis irhitiiryi Remond. Proe. Calif. Acad. Soi., vol. 3, 1863, p. 52. 

 Astrodapsis whitneyi. Meek, Sniithson. Misc. Coll., vol. 7, no. 183, 1864, 

 p. 2. 



Astrodapsis ivMtneyi. Gabb, Calif. Geol. Surv., Pal., vol. 2, 1869, jjp. 37, 



110, pi. 13, figs. 67, 67a. 

 Astrodapsis icMtneyi. Cooper, Seventh Rept. Calif. State Mineralogist, 



1888, p. 271. 



Astrodapsis whitneyi. Merriam, Univ. Calif. Publ. Bull. Dept. Geol., vol. 



2, 1898, pp. 110, 111, 112, 117 (cited). 

 Astrodapsis whitneyi. Merriam, Proc. Calif. Acad. Sci., ser. 3, Geol., vol. 



1, 1899, p. 167, pi. 21, figs. 4, 4a. 

 Not Astrodapsis whitneyi. Arnold, U. S. Geol. Surv. Bull., no. 396, 1909, 



p. 63, pi. 11, fig. 1. See A. calif ornicus. 

 Astrodapsis whit7ieyi. Stefanini, Boll. Soc. geol. ital., vol. 30, 1911, p. 703. 

 Astrodapsis whitneyi. Clark and Twitchell, U. S. Geol. Surv. Mon., vol. 



54, 1915, pp. 201-202, pi. 95, figs. 2a-2r. 

 Astrodapsis ivhitneyi. B. L. Clark, Univ. Calif. Publ. Bull. Dept. Geol., 



vol. 8, 1915, pi. 42, fig. 1 (figure only). 

 Astrodapsis ivhitneyi. Kew, ibid., p. 372, pi. 40, fig. 4. 



H&aiitotype.—No. 11004 Univ. Calif. Coll. Invert. Pal. 



Test of moderately large size. Measurements of specimen 11004 : 

 anteroposterior diameter 62.4 mm., transverse diameter 61.8 mm., 

 greatest height 11.5 mm. Outline subeircular; margins thin; sub- 

 marginal area nearly flat, with superior surface strongly arched 

 from the extremities of the petals to the apical system, giving the 

 test a bell-shaped appearance. Margin notched in the ambulacral 

 areas, the two posterior notches being broader and deeper than the 

 others; summit coincides with apical system. The latter is slightly 

 eccentric to the anterior of the center. Four genital pores and five 

 perforated radial plates present. Ambulacra wider than the inter- 

 ambulacra at the ambitus; ambulacra petaloid. Lateral petals narrow, 

 distinctly elevated, wide open at their ends, and extending nearly to 

 the margin. Inner rows of rounded pores after first diverging extend 

 in almost straight lines, converging slightly about three-fourths the 

 distance to the margin ; outer rows of transversely elongate pores 



