428 



PROF. F. J. BELL ON THE ECHINOMETRIDjE. [Mar. 15, 



and Feilden collected them at Franklin-Pierce Bay, Cape Napoleon, 

 and Hayes Point, during the Arctic Expedition of 1875-76 ; Capt. 

 Markham found specimens at 73" 10' lat., 53° long. ; the officers 

 of the 'Valorous' Expedition collected specimens off Greenland. 

 Other examples have lately been received from the United States 

 Fishery Commission, which collected them at Eastport, Maine. 



Strongylocentrotus erythrogrammtjs. 



Strongylocentrotus franciscanus. 



Strongylocentrotus gibbosus. 



This species, obviously, does not lend itself to proportional mea- 

 surements. 



Strongylocentrotus lividus. 



' Madreporic plate considerably swollen. 



