ECHINOIDEA. II. 



191 



(Sterech. Neymayeri, on the contrary, has pelagic larvae). 1 - - That there are no bipolar Echini I have 

 pointed ont already in Part I of this work. 



Perhaps also the Antarctic deep-sea will prove to form a distinct region; in any case it is a 

 noteworthy fact that a number of very peculiar forms: Pourtalesia ceratopyga, carinata, hispida, Spatago- 

 cystis Challengeri, Echinocrepis cuneata, Genicopatagus affinis, are hitherto known only from these 

 tracts of the ocean. 



1 This will be treated in the Report on the Echinoidea of the German South Polar-Expedition. 



