OPHIURANS OF THE PHILIPPINE AND ADJACENT WATERS. 429 



152 meters (83 fathoms) ; February 24, 1909; gn. M. (m. b.). 



Two specimens (Cat. No. 41346, U.S.N.M.) 



Albatross station 5420; between Cebu and Bohol; Cruz Point 

 (Bohol) bearing S. 20° E., 11.1 kilometers (6 miles) distant (lat. 9° 

 49' 35" N., long. 123° 45' 00" E.) ; 231 meters (127 fathoms) ; March 

 24, 1909. 



Thirteen specimens (Cat No. 40931, U.S.N.M.). 



Albatross station 5423; Jolo Sea; Cagayan Island (S.) bearing 

 S. 11° E., 8.89 kilometers (4.8 miles) distant (lat. 9° 38' 30" N., 

 long. 121° 11' 00" E.) ; 929 meters (508 fathoms) ; March 31, 1909; 

 gy. M., co. S. 



One specimen (Cat No. 41345, U.S.N.M.) 



Description. — I shall describe this species from the two specimens 

 from station 5371; in the larger the diameter of the disk reaches 

 10 mm., but the arms are all incomplete; in the smaller the diame- 

 ter of the disk is 8 mm. and the arms are 30 mm. long; the arms 

 are slender, thin and elongated, only slightly broadened at the 

 base, and they taper very slowly. The specimens from stations 

 5420 and 5423 are identical with the smaller specimen from sta- 

 tion 5371, and the diameter of their disk varies between 7 mm. and 

 8 mm. The arms are thin, slender, and relatively long. In differ- 

 ent specimens from station 5420 the diameter of the disk varies 

 between 7 mm. and 8 mm., and the arms, which are very long and 

 always rather narrow, may reach a length of 40 mm. 



The disk is subpentagonal ; the two surfaces are almost plane, 

 passing into each other over a rounded border. The dorsal surface 

 is covered with numerous unequal plates, among which there is dis- 

 tinguishable a certain number which are larger than the others 

 and rather uniform in size; they are all rounded; between them 

 are found a large number of very much smaller plates. The six 

 primary plates are scarcely larger than the others, and the dorso- 

 central plate is a little smaller than the five radials; between these 

 latter and the central plate there is a circlet of five smaller inter- 

 radial plates, and several other extremely reduced plates. 



The other large plates include a row of four or five consecutive 

 plates which occupy the middle line of each interradius; these are 

 circular except that on the periphery of the disk, which is trans- 

 versely broadened. In the radial regions there is a large plate the 

 external border of which lies almost at the level of the proximal 

 angle of the radial shields; following this there is a smaller plate, 

 then a series of three or four rectangular plates which are continu- 

 ous with the upper arm plates, and, with the preceding plate, sepa- 

 rate the two radial shields of each pair. Other smaller rounded 

 plates occur intercalated between the preceding, especially in the 



