242 



THE VOYAGE OF H.M.S. CHALLENGER. 



To recapitulate, we may state that of the 297 known species of Echinids no less than 

 201 species are littoral, 46 are continental, and 50 abyssal or oceanic. Of the littoral 

 species, 36 extend beyond the 100 fathom line into the continental range, and of these 

 10 also extend beyond it into the abyssal range. The species having the greatest 

 bathymetrical range (over 1000 fathoms) are — 



Goniocidaris canalicuhda, 

 EcJiinus ac7dus, 

 Ecliimis magellanieus, . 

 Erhinocardium ausfrale, 

 Brissojists luzoritca, 

 Brissopsis lyrtfera, 



littoral to 1975 fathoms. 



1350 

 „ 1600 



2G75 

 „ 1100 



2435 



Of the continental species 1 4 extend beyond the usual limits of the continental range 



