50 



University of California Publications in Geology [Vol. 8 



CLYPE ASTER BOWERSI Weaver. 

 Plate 4 and Plate 5 

 Clypeaster bowersi Weaver, Univ. Calif. Publ. Bull. Dept. Geol., vol. 5, 

 pp. 271-272, plate 21, figure 1, and plate 22, figure 1. 1908. 



Outline suboval to pentagonal. Test thick and very large. 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. Anterior petal somewhat raised. 

 Two lateral petals of the trivium shorter than the remaining ones. Odd 

 anterior petal narrower than the others. Pores conjugate. Apical 

 system central and of small size. 



Actinal surface nearly flat, with actinostome deeply sunken. Anus 

 large, depressed and located at the inframargin of the test. Ambulacral 

 furrows narrow, deep, and extend from the mouth to the edge of the 

 test. Tubercles the same size over whole of the test and tuberculation 

 uniform on both upper and lower surfaces. 



Clypeaster bowersi Weaver resembles very closely Echinanthus 

 (Clypeaster ?) testuclinarius Gray living in the Gulf of California. 

 Clypeaster bowersi averages larger in size and has a slightly more 

 elevated test than Echinanthus testuclinarius. The anus of the former 

 is situated at the edge of the test while that of the latter is its own 

 diameter away from the margin. 



Occurrence. — Lower Division of the Carrizo formation at Coyote 

 Mountain. University of California Localities 737, 738, 739, and 2064. 



Measurements. — Maximum anteroposterior diameter, 162.0 mm.; 

 maximum transverse diameter, 151.4 mm. ; maximum thickness, 48 mm. 



HIPPONOE CALIFORNIA, n. sp. 

 Plate 1, figure 2 



A species of the Echinometridae of large size, having a thin conical 

 test with the ambitus situated near the base. Actinal surface some- 

 what concave. Ambulacra broad, with the poriferous area equal to 

 the non-poriferous area. Poriferous zones consisting of three pairs 

 of conjugate pores arranged obliquely and placed one above the other, 

 forming radial lines. Middle pair sporadic. Furrows joining pores 

 becoming very marked below ambitus. Tubercles on ambulacra irreg- 

 ularly placed on both poriferous and non-poriferous plates. Interam- 



