NORTH PACIFIC OPHIURANS IN NATIONAL MUSEUM — CLARK. 187 



Lucality. — Albatroufi sLutioii 1U7U, oil" oufstciu -Japan, lat. 33° 53' N.; 

 loiii^. 137° 42' E., 943 fathoms, brown mud, line sand, foraminifera, 

 bottom temperature 36.4°, 1 specimen. 



Type.— Cat. No. 25636, U.S.N.M., from station 4979. 



The o;roui)s of <i;ranular papillae near the distal entl of the mouth 

 slits are very peculiar, jjivino; a characteristic ap])earance to the oral 

 region, anil indicate a possible relationship to O phiocamax lithosora. 

 Whether the sunken 

 appearance of the ra- 

 dial sliields and the 

 correspondingly re- 

 markable division of 

 the disk into fifteen 

 wedge-shaped parts 

 is characteristic of 

 the species or only an 

 accentuated individ- 

 ual peculiarity can 

 not, of course, be de- 

 termined w i t h o u t 

 more material. But 

 it is hard to doubt 

 that the main fea- 

 tures of the peculiar 

 disk will be found to 

 be characteristic of 

 the species. 



OPHIOMITRA POLYA- 

 CANTHA, new species." 



Disk 6 mm. in di- 

 ameter; arms al)oiit 

 30 mm. long. Disk 

 circular, covered 

 with numerous 

 small, rather regular 

 scales, many of which 

 bear each a low, thorny stump. Radial shields small, triangular or 

 s({uarish, about as wide as long, distinctly separated. Upper arm 

 plates small, rhombic or triangular, with convex distal margin, widely 

 separated from each other; between the upper arm plates the arm is 

 somewhat constricted. Interbrachial spaces below, covered with 



a fJo^iuc, signifying many and &KavOa, signifying spine, in reference to the large 

 number of arm spines. 



Fig. 81).— Ophiomitra polyac.\ntha. X 8. a. from above: b. from 

 below; c. side view ok two arm joints near disk. 



