PLATE XII. 



Hemicidaris intumescens Clark (page 44). 



Fig. la. Upper surface of tlie test. 



lb. Lower surface of the test. 



Ic. Lateral view of the same. 



Id. Two interambulacral plates, highly maguified. 



le. Lower portion of interambulacral area, enlarged. 



1/. Upper portion of same. 



Ig. Portion of ambulacral area, magnitied. 



Ih. Tubercle, from above. 



li. Lateral view of the same. 



PsEUDODiADEMA Emersoni Clark (page 45. 



Fig. 2a. Lateral view of the test. 



26. Portion of the interambulacral area, enlarged. 

 2c. Portion of the ambulacral area, enlarged. 

 2d. Tubercle, from the side. 

 2e. The same, from above, 

 i28 



