Plate 38. 

 1-3. ColobocentrotuB Stimpsoni A. Ag. 



1. The same as the specimen figured on Plate 37, seen from the actiual side, denuded of 



its spines, measuring 65 mm. in diameter. 



2. The same seen from the abactinal side. 



3. Profile of the same, facing the odd anterior ambulacrum. 

 All figures are natural size. 



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



