OPHIURANS OF THE PHILIPPINE AND ADJACENT WATERS. 65 



Albatross station 5447; east coast of Luzon, San Bernardino Strait 

 to San Miguel Bay ; San Miguel Point bearing S. 7° W., 6.49 kilo- 

 meters (3.5 miles) distant (lat. 13° 28' 00" N., long. 123° 46' 18" E.) ; 

 567 meters (310 fathoms) ; June 4, 1909 ; gn. M. 



Two specimens (Cat. No. E. 44, U.S.N.M.). 



Albatross station 5618; Molucca Passage; Mareh Island bearing 

 S. 69° E., 14.45 kilometers (7.8 miles) distant (lat. 0° 37' 00" N., 

 long. 127° 15' 00" E.) ; 763 meters (417 fathoms) ; November 27, 1909 ; 

 gy. M. 



Two specimens (Cat. No. E. 40, U.S.N.M.). 



Albatross station 5619; Molucca Passage; Mareh Island (S.) bear- 

 ing S. 78° E., 12.97 kilometers (7 miles) distant (lat. 0° 35' 00" N., 

 long. 127° 14' 40" E.) ; 796 meters (435 fathoms) ; November 27, 

 1909 ; fne. gy. S., M. 



Twenty specimens (Cat. Nos. 41374, E. 39, E. 43, U.S.N.M.). 



Albatross station 5647; Buton Strait; North Island (S.) bearing 

 S. 87° E., 21.50 kilometers (11.6 miles) distant (lat. 5° 34' 00" S., 

 long. 122° 18' 15" E.) ; 949 meters (519 fathoms) ; December 16, 1909; 

 gn. M. 



One specimen (Cat. No. 41186, U.S.N.M.). 



Albatross station 5651; Gulf of Boni, Celebes; Buginkali Point 

 bearing S. 67° E., 38.92 kilometers (21 miles) distant (lat. 4° 43' 50" 

 S., long. 121° 23' 24" E.) ; 1,280 meters (700 fathoms) ; December 

 17, 1909; gn. M. 



Two specimens (Cat. No. E. 38, U.S.N.M.). 



Notes. — These specimens agree perfectly with those collected by 

 the Siboga. The diameter of the disk varies between 10 mm. and 

 14 mm., and the arms are always very long; in the specimen from 

 station 5618, which has a disk diameter of 12 mm., the arms are 80 

 mm. in length. 



The granules of the dorsal surface of the disk are slightly rugose 

 and are usually somewhat elongated, especially toward the periphery 

 of the disk (pi. 92, fig. 6). The arm spines show certain variations, 

 which do not appear to depend entirely on the size of the individuals. 

 Generally when the diameter of the disk reaches or exceeds 12 mm., 

 the largest arm spines attain a length of two segments, and some- 

 times even of three; ordinarily the antepenultimate dorsal spine is 

 the longest. But I have at hand specimens in which the disk is more 

 than 12 mm. in diameter, yet the longest arm spine does not exceed 

 a segment and a half. At the base of the arms the spines are seven 

 in number, the figure falling to six beyond the disk, and finally to 

 five toward the middle of the arms. In the smallest specimens the 

 number seven falls rapidly to six, and then to five. 



I can not find any character by which O. lambda, described in 

 1911 by H. L. Clark from Japenese specimens, may be distinguished 

 55269— 22— Bui. 100 5 



