1920] Kew: Cretaceous and Cenozoic EcMnoidea 59 



Cotypes.—^ofi. 10059 and 10060 Univ. Calif. Coll. Invert. Pal. 



Outline suboval to pentagonal. Test thick and very large. Meas- 

 urements of average sized specimen, no. 10060 Univ. Calif. Coll. Invert. 

 Pal. : anteroposterior diameter 133 mm., transverse diameter 113.7 mm., 

 greatest thickness 41 mm. Profile rounded to subtriangular. Edges 

 of test swollen in some specimens. Margin slightly reentrant opposite 

 the interambulacral areas. Petals broad, obovate, and nearly closed 

 at their extremities. Poriferous areas narrow and slightly sunken. 

 Interporiferous areas of petals somewhat raised. Two lateral petals 

 of the trivium shorter than the other petals. Odd anterior petal nar- 

 rower than the others. Pores conjugate. Apical system central and 

 small. Actinal surface nearly flat, with peristome deeply sunken. 

 Anus large, depressed, and located immediately below the margin of 

 the test. Ambulaeral furrows narrow, deep, and extending from the 

 mouth to the edge of the test. Tubercles small, crowded, and uniform 

 in size over the whole test. 



Related forms. — Clypeaster bowersi Weaver resembles very closely 

 Echinanthus {Clypeaster?) testudinarius Gray living in the Gulf of 

 California. The average size of Clypeaster bowersi is larger and it 

 has a slightly more elevated test than Eehiuanthus testudinarius. The 

 anus of the former is situated at the edge of the test while that of 

 the latter is situated away from the margin a distance equal to its 

 own diameter. 



Geologic horizon. — Lower Division of the Carrizo Creek beds, 

 Pliocene. 



Locality. — Coyote Mountain, Imperial County, California, Univ. 

 Calif, loc. 2064. 



CLYPEASTER CAEEIZOENSIS Kew 



Plate 7, figures 2a, 2b 



Clypeaster carrizoensis Kew. Univ. Calif. Publ. Bull. Dept. Geol., vol. 8. 

 1914, p. 49, pi. 2, figs. 2a-2h. 



Holotijpe.— No. 10047 Univ. Calif. Coll. Invert. Pal. 



Test small. Measurements : maximum anteroposterior diameter 

 24 mm., maximum transverse diameter 21 mm., maximuni height 7 mm. 

 Outline pentagonal to suboval, with slight notch opposite the inter- 

 aml)ulacrHl areas. Test depressed, thick, and edge slightly swollen. 

 Apical system central, elevated but little. Petals tumid and wide 

 open at the ends, extending over one-half the distance to the margin. 

 Interporiferous spaces slightly raised, but pores sunken, especially the 



