42 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 8 



Color. — Dried specimen, disk and arms above dull dark gray and 

 olive buff irregularly mottled. On the disk scales the color is lighter and 

 more distinct. Interbrachial disk plates have a central, light cream color 

 area encircled with a narrow dark brown band. Entire under surface 

 cream color, general appearance light drab gray. 



Types.— llo\oX.yY>^, AHF no. 14; 222 paratypes, 11 in M.C.Z. 



Type locality. — Holotype and 191 paratj^pes, 9 in the Museum of 

 Comparative Zoology, from Station 483-35, 6 fms., Tenacatita Bay, 

 Mexico, February 15, 1935. Thirty-one paratypes as follows: 24, 2 in 

 Museum of Comparative Zoology, from Station 116-33, 2 fms., Cocos 

 Bay, Puerto Culebra, Costa Rica, March 13, 1933; 6 from Station 965- 

 39, 8-15 fms., Tenacatita Bay, Mexico, May 8, 1939, and one from 

 Station 964-39, 2-8 fms., Tenacatita Bay, Mexico, May 8, 1939. 



Remarks. — This species is related to O. variegata Liitken and 

 O. crassa Nielsen, differing from both by its depressed disk, broad, short, 

 and markedly tapering arms, the large, rounded interbrachial plates, 

 larger and broader oral shields, and color pattern. These characters are so 

 conspicuous that O. plateia cannot be confused with any known species of 

 the genus. The name selected, plateia^ refers to the unusually depressed 

 disk. 



