122 



University of California Puhlioatiom in Geology [Vol. 12 



This form, now living on the Pacific Coast, has been described so 

 often in other works that it seems unnecessary to repeat it here. The 

 figured specimens have been chosen from a large number to illustrate 

 some variations which occur in the petals. 



Geologic horizon. — Pleistocene and Recent. A form of this species 

 averaging slightly smaller in size, is also found in the Lower Fernando 

 formation, Lower Pliocene. 



Localities. — Recent form from coast of California, Canada, and 

 Alaska. Occurs in San Pedro formation. Pleistocene, near San Pedro, 

 Los Angeles County, California. Pliocene form from Elsmere Canyon, 

 near Newhall, Los Angeles County, California. 



DENDRASTEE GIBBSII (Remond) 

 Plate 25, figures 2a, 2b, 2c 



ScuteUa gibbsii Beniond. Proc. Calif. Acad. Sci., vol. 3, 1863-67, pp. 13, 14. 



Scutella gibbsii. Meek, Smithson. Misc. Coll., vol, 7, no. 183, p. 2, 1864. 



ScuteUa gibbsii. Gabb, Geol. Surv. Calif., Pal., vol. 2, 1869, pp. 37, 109, 

 pi. 13, figs. 66, 66a. 



ScuteUa gibbsii. Cooper, Cat. Calif. Fossils, Seventh Rcpt. State Mineral- 

 ogist, 1888, p. 271. 



Echinarachnius gibbsi Merriam, Proe. Cal. Acad. Sci., ser. 3, Geol., vol. 1, 



1899, p. 169, pi. 22, fig. 7. 

 ScuteUa gibbsi. F. M. Anderson, Proc. Calif. Acad. Sci., ser. 3, Geol., 



vol. 2, 1905, p. 180 (listed). 

 Echinarachnius gibbsii. Pack, Univ. Calif. Publ. Bull. Dept. Geol., vol. 5, 



1909, pp. 282-283. 



Echinaraclinitis gibbsii. In part, Arnold, U. S. Geol. Surv. Bull., no. 396, 

 1909, pi. 13, figs. 1, 2; pi. 19, figs. 1, 2; pi. 20, fig. 7. 



Echinarachnius gibbsii. In part, Arnold and Anderson, U. S. Geol. Surv. 

 Bull., no. 398, 1910, pi. 35, figs. 1, 2; pi. 41, figs. 1, 2; pi. 42, fig. 7 



Bendraster gibbsi. Stefanini, BolL Soe. geol. itaL, vol. 30, 1911, p. 704. 



Dendraster gibbsii. Clark and Twitchell, U. S. Geol. Surv. Mon., vol. 54, 



1915, pp. 193-195, pi. 89, figs, la, lb, 2, 3, 4; pi. 108, fig. B. 

 Dendraster gibbsii. Nomland, Univ. Calif. Publ. Bull. Dept. Geol., vol. 9, 



1916, p. 81; ibid., p. 202 (listed). 



Holotype. — No. 11050 Univ. Calif. Coll. Invert. Pal.; figured speci- 

 mens, 11021 and 11380 Univ. Calif. Coll. Invert. Pal. 



Test of medium size. Measurements of specimen no. 11021 Univ. 

 Calif. Coll. Invert. Pal. : anteroposterior diameter 49.2 mm., transverse 

 diameter 45.0 mm., greatest height 10.3 mm. Outline suboblong to 

 subquadrate, often suboval to subcircular. The sliape is quite variable 

 and the greatest diameter may be either in the transverse or antero- 



