TROPICAL PACIFIC ECHINI. 



THE GENUS COLOBOCENTROTUS. 



CoLOBOCENTROTUs Brandt (A. Ag. emend.). 



Colobocentrotus Brandt, 1835, Prod. p. 66. 

 Colobocentrotus A. Ag. Rev. Echini, p. 423 (partim). 



This genus is now limited to such species as Colobocentrotus Mertensii 

 Brandt and Coloh. Stimpsoni A. Ag., the better known species, C. atratus and 

 C. piedifer, having been separated from it and united in the genus Podophora 

 Agass. 



The following are the species of Colobocentrotus and of Podophora 

 described in this memoir : 



Colobocentrotus Mertensii Brandt. 



Colobocentrotus Mertensii Brandt, 1835, Prod., p. 66. 



Colobocentrotua Mertensu A. Ag. (partim) Rev. Echini, 1872, p. 103, PI. IIP, figs. 4, 5, 



p. 426. Bonin Islands. 

 Colobocentrotua Leskei A. Ag. 1863. Proc. Phila. Acad. p. 354 is a slip of the pen for 



Colobocentrotus Mertensii Brandt. 

 Colobocentrotus quadriseriatus Trosch., noted by Troschel as occurring in Australia, is, I 



should say from his description, Colob. Mertensii Brandt. 



This species was collected by Dr. Wm. Stimpson at Port Lloyd, Bonin 

 Islands, North Pacific Exploring Expedition, under Captains Ringgold and 

 Rodgers, It is figured in the Revision of the Echini, Plate III'', figs. 4, 5. 



Stimpson says it is found " in surf-washed rocks." 



Colobocentrotus Stimpsoni A. Ag.^ ^ u "J^-V^' / 



Is the large grayish pink species collected by Dr. Stimpson at the Bonin 

 Islands, North Pacific Exploring Expedition, and described later on. 



The species of Colobocentrotus have thus far only been collected at the 

 Bonin Islands and, according to Troschel, in Australia. 



