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



EXPLANATION OF PLATE 21 



PAGE 



Fig. 1. Clypeaster cubensis Cotteau. Lateral surface of test. Cal. 



164 



Acad. Sci. No. 370. X 132 



146 

 Fig. 2. Metalia cumminsi Kew. Lateral surface of test. Cal. Acad. 



145. S 



Sci. No. 371 ; type. X 133 



98.7 



Fig. 3. Clypeaster cf. concavus Cotteau. Lateral surface of test. Cal. 



75.5 



Acad. Sci. No. 372. X 



50 



