TROPICAL PACIFIC ECHINI. 
THE GENUS COLOBOCENTROTUS. 
CoLoBocENTROTUS Brandt (A. Ag. emend.). 
Colobocentrotus Brandt, 1835, Prod. p. 66. 
Colobocentrotus A. Ag. Rey. Echini, p. 423 (partim). 
This genus is now limited to such species as Colobocentrotus Mertensii 
Brandt and Colob. Stimpsoni A. Ag., the better known species, C. atratus and 
C. pedifer, 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. 
Colobocentrotus Mertensii A. Ag. (partim) Rev. Echini, 1872, p. 103, Pl. III‘, figs. 4, 5, 
p. 426. Bonin Islands. 
Colobocentrotus 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. 
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. 
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