RECENT OPHIURANS. 261 



distal end w-ider than proximal ; more or less in contact. Side arm-plates rather 

 small but each carries 4 arm-spines (distally only 3); these are short, thick, 

 blunt and subequal. Tentacle-scale 1, relatively large. Colors in life, orange 

 and brown; dried (from formahn-corrosive-sublimate solution), disk variegated 

 dull reddish purple and dull, very pale yellow; each radial shield is dark with a 

 conspicuous Ught spot at distal end; arms hght with, a broad mid-dorsal stripe 

 of dull purplish, which fades out completely on distal half of arm, but proximally 

 expands on every other upper arm-plate (or on two consecutive plates sometimes) 

 to form an indefinite band around the arm; oral surface and arm-spines light, 

 but many of the spines have a narrow band of purpUsh around them near the 

 middle. 



HoLOTYPE (M. C. Z.-3729). Torres Strait: Murray Island, Mer, off 

 southwestern reef, 18 fms. Carnegie Exp. 1913. H. L. Clark coll. Found 

 on a comatuUd {Comanthus annulatum) and apparently commensal, since it 

 was on the comatulid when the latter was taken from the sea. 



Although it is probable that this specimen is young, it seems to be well 

 characterized by the combination of a single large, oral papilla, four arm-spines 

 and adoral plates forming a ring. The coloration is also different from that of 

 any Ophiactis heretofore described. 



752. O. DUPLICATA (Ltman). 



Amphiura duplicata Ltman, 1875. Illus. cat. M. C. Z., no. 8, pt. 2, p. 19, f. 87, pi. 5, f. 78. 

 Ophiactis duplicata Lutken and Mortensen, 1899. Mem. M. C. Z., 23, p. 142, pi. 6, f. 1-3. 



71 specimens, including holotype and 3 paratypes. Gulf of Panama: 

 southeast of Malpelo Island, 899 fms. Gulf of Mexico, 220-539 fms. Off St. 

 Cruz, D. W. I., 115-508 fms. Off St. Kitts, 208-250 fms. Off Nevis, 356 fms. 

 Off Montserrat, 88-298 fms. Off Guadeloupe, 175-734 fms. Off Dominica, 

 333-390 fms. Off Martinique, 170-476 fms. Off St. Lucia, 116-423 fms. Off 

 St. Vincent, 573 fms. Off the Grenadines, 338 fms. Off Cannouan, 127 fms. 

 Off Carriacou, 163 fms. Off Grenada, 291-416 fms. Off Barbados, 73-218 

 fms. Brazil? 



753. 0. FLEXUOSA Lyman, 1879. Bull. M. C. Z., 6, p. 37, pi. 13, f. 347-349. 



2 specimens, including a cotype and a cotype of var. perplexa Koehler. 

 Near Kermadec Islands, 600 fms. Dutch East Indies: east of Ceram, 315 

 fms. 



754. O.GYMNOCHORA H.L.Clark, 1911. BuU. 75 U. S. N. M., p. 139, f. 54. 



1 COTYPE. Japan: Tanegasima. 



