150 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



EXPLANATION OF PLATE 23 



PAGE 



Fig. 1. Metalia cumminsi Kew. Upper surface of test. Cal. Acad. 



109 



Sci. No. 371, type. X 133 



90 



Fig. 2. Clypeaster, species A. Upper surface of test. Cal. Acad. Sci. 



82 



No. 373, type. X — 



60 



