298 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



distinguished the transverse tubercles, larger than the others, which 

 were especially noticed by Loriol (pi. 69, fig. 3). 



The general coloration is pinkish gray, with dark blue striae on 

 the dorsal surface of the disk and on the arms. The specimen from 

 station 5169, which is almost of the same size as the preceding, shows 

 a darker coloration; the general tint on the dorsal surface of the 

 disk is a rather dark blue, and the ventral surface is gray ; the dor- 

 sal surface of the disk shows wavy striae with some dark blue spots 

 which are more numerous than on the specimen from station, 5151 ; tf 

 this individual is remarkable for the slight developmental the 

 tubercles of the dorsal surface of the disk. These tubercle^Jpcely,^ 

 appear except toward the periphery of the disk, and it is seldom that 

 a small one is seen here and there on the radial shields; the central 

 region of the disk is quite without them. On the arms these tubercles 

 are relatively less numerous than in the specimen from station 5151 ; 

 but in compensation the transverse tubercle of each segment is more 

 marked while the others are smaller and less numerous, and do not 

 form the two more or less apparent transverse series which are dis- 

 tinguishable in that from station 5151. These smaller tubercles 

 occur only on the first arm segments, and they disappear rapidly so 

 that the large transverse tubercle alone persists. 



I have thought it necessary to give my specimens the name of 

 Ophiothela danae for the same reasons that I gave in 1905, and I 

 still believe that there is no necessity for separating O. danae and 

 O. isidicola; the species so understood is rather widely distributed 

 in the Indo-Pacific region. 



Matsumoto, who has recently recorded 0. danae from various 

 localities in Japan, also concedes its identity with O. isidicola, and 

 with 0. verrilli Duncan as well. He describes the different variations 

 of Japanese individuals ('17, p. 230). 



OPHIOTHELA VINCULA Mortensen. 



Plate 59, fig. 4. 



Ophiothela vincula MORTENSEN ('13), p. 14, pi. 1, figs. 11-13. H. L. CLABK 

 ('15), p. 285. 



Locality. Albatross station 5218; between Burias and Luzon; 

 Anima Sola Island (E.) bearing N. 10 W., 3.71 kilometers (2 miles) 

 distant (lat. 13 11' 15" N., long. 123 02' 45" E.) ; 36 meters (20 

 fathoms) ; April 22, 1908; crs. S. 



One specimen. 



Notes. The specimen agrees well with Mortensen's description. 

 The diameter of its disk is 4 mm. I include a photograph of it. 



The type series of O. vincula came from the Philippines (San Ber- 

 nardino Strait) , where it was met with at a depth of from 50 to 100 

 fathoms (92 to 184 meters). 



