STRONGYLOCENTROTUS ECHIXOIDES. 361 



diversity; they may be simply bihamate, or rods, m'>re or less curved, more or 

 less flattened and more or less branched at the tips. 



The geographical distribution of echinoides apparently coincides with that of 

 drohachiensis, in the North Pacific, as will be seen from the table of stations gi\'en 

 below. When described it was supposed to be confined to the western side of 

 the ocean but a specimen from Alaska and another from off Oregon is at hand. 

 The former is quite young but the latter is an adult in fine condition and very 

 typical of the species, and there seems to be no reason for doubting the correct- 

 ness of the label. The following list shows the conditions under which echinoides 

 lives : — 



Station 3053. Off Oregon, 44° 4' 30" N., 124° 50' W. Bott. temp. 47.3°. 

 64 fathoms. Co., brk. sh., rky. 



Station 4253. Off Thistle Ledge, Stephens Passage, Alaska. Bott. temp. 

 40.9°. 131-188 fathoms. R., brk. sh. 



Station 4777. Petrel Bank, Bering Sea, 52° 11' N., 179° 49' E. Bott. temp.? 

 43-52 fathoms. Fne. g. 



Station 4778. Petrel Bank, Bering Sea, 52° 12' N., 179° 52' E. Bott. temp.? 

 33-43 fathoms. Fne. blk. g. 



Station 4779. Petrel Bank, Bering Sea, 52° 11' N., 179° 57' W. Bott. temp.? 

 54-56 fathoms. Brk. sh., p., s. 



Station 4782. Off East Cape, Attu Island, Aleutians, 52° 55' N., 173° 27' E. 

 Bott. temp.? 57-59 fathoms. R., g. 



Station 4784. Off East Cape, Attu Island, Aleutians, 52° 55' 40" N., 

 173° 26' E. Bott. temp.? 135 fathoms. Crs. p. 



Station 4786. Between Medni and Bering Islands, Komandorskis, 54° 51' 

 30" N., 167° 14' E. Bott. temp.? 54 fathoms. Gn. s. 



Station 4787. Between Medni and Bering Islands, Komandorskis, 54° 50' 

 50" N., 167° 13' 30" E. Bott. temp.? 54-57 fathoms. Gn. s. 



Station 4788. Between Medni and Bering Islands, Komandorskis. 54° 50' 

 24" N., 167° 13' E. Bott. temp.? 56-57 fathoms. Gn. s. 



Station 4789. Between Medni and Bering Islands, Komandorskis, 54° 49' 

 45" N., 167° 12' 30" E. Bott. temp.? 56 fathoms. Gn. s. 



Station 4790. Between Medni and Bering Islands, Komandorskis, 54° 38' 

 45" N., 167° ir 45" E. Bott. temp.? 64 fathoms. P. 



Station 4791. Between Medni and Bering Islands, Komandorskis, 54° 36' 

 15" N., 166° 58' 15" E. Bott. temp.? 72-76 fathoms. Rky. 



Station 4792. Between Medni and Bering Islands, Komandorskis, 54° 36' 

 15" N., 166° 57' 15" E. Bott. temp.? 72 fathoms. P. 



