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



EXPLANATION OF PLATE 18 



Fig. la. Schizaster clevei Cotteau. Upper surface of test. Cat. Acad. 

 76 



Sci. No. 367. X 



48.5 

 Fig. lb. Schizaster clevei Cotteau. Lower surface of test. Cal. Acad. 

 76 



Sci. No. 367. X 



48.5 

 Fig. Ic. Schizaster clevei Cotteau. Lateral surface of test. Cal. Acad. 

 74 



Sci. No. 367. X 



48.5 



Fig. 2. Schizaster scherzeri Gabb. Lower surface of test. Cal. Acad. 

 69 



Sci. No. 368. X 



54 



