Plate 34. 



1-3. Colobocentrotua Stimpsoui A. Ag. 



1. Seen from the actinal side ; denuded of its spines. 



2. The same seen from the abactiual side. 



3. The same specimen, seen in profile, facing the odd anterior ambulacrum. 

 All figures are natural size. 



Bonin Ids., Captains Ringgold and Rodgers, N. P. Ex. Ex., Dr. Wm. Stimpson Coll. 



