208 



THE VOYAGE OF H.M.S. CHALLENGER. 



List of the known Species of Recent Echinoidea, showing theie, Range in Depth, and their 

 Principal Localities ;^ and giving an Indication of the Geological Distribution 

 OF THE Genera. 



Explanation of Letters, &c. 



B. " Blake " and United States Coast SiU'vey 



Expeditions. 



C. " CliaUenger " Expedition (EngHsli). 

 J. " Josephine " „ (Swedish). 



P. " Porcupine " Expedition (English). 

 Val. "Valorous" „ ( „ ). 



* Species discovered by the Challenger. 

 X Previously kno\vn species collected hy the Challenger. 



In the Bathymetrical Range. 



— 250 B. means that the species extends from the shore to 250 fathoms, and that the greatest depths have been determined by the 

 B. = " Blake " Expedition. 



410-500 C. gives the upper and lower limits as determined by the C. = " Challenger " Expedition. 



[ 180 J. that the species has only been collected at that depth by the J. = " Josephine " Expedition, and that nothing further is 

 known of its bathymetrical range. 



' For detailed lists of localities see A. Agassiz, Revision of the Echini, part 1 ; Mem. Mus. Comp. Zool., vol. iii. ; lU. Cat., No. 7. 



