302 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Albatross station 5179; in the vicinity of Romblon; Romblon 

 Light bearing S. 56 E., 8.34 kilometers (4.5 miles) distant (lat. 

 12 38' 15" N., long. 122 12' 30" E.) ; 68 meters (37 fathoms) ; 

 March 25, 1908 ; hrd. S. 



One specimen (Cat No. 41309 U.S.N.M.). 



Notes. The two specimens from station 5150, in which the 

 diameter of the disk does not reach 5 mm., are quite in agreement 

 with Lud wig's description, especially in reference to the form of the 

 club spines with their funnel-like ends which cover the dorsal surface 

 of the disk. I show the two surfaces of one of these, as well as a 

 more enlarged portion of the dorsal surface of the disk (pi. 60, figs. 

 1,2,5). 



The specimen from station 5136, in which the diameter of the disk 

 is only 4 mm., is interesting in that its club spines are less developed 

 and resemble rather club spines terminated by a crown of simple 

 spinules like those met with in numerous species of Ophiothrix. 

 These club spines are smaller than is usual in O. elegans, and they 

 bear a crown formed by a half dozen short spinules which are united 

 by a slightly developed membrane (pi. 103, fig. 4d). In the specimen 

 from station 5179, in which the disk has almost the same diameter, 

 these club spines are more differentiated, and their funnel-like form, 

 which is more marked, recalls those which I find in the specimens 

 from station 5150. On the border of the disk the transformation of 

 the complicated club spines of the dorsal surface into the ordinary 

 club spines terminated by simple spinules which are seen on the 

 central surface may be followed. 



The hook formed by the first ventral arm spine is thick and well 

 developed ; it agrees with the ordinary three-branched form ; the size 

 of the branches diminishes from the last to the first, which may be 

 rather stout (pi. 103, fig. 45). The tentacle scale, which is fairly 

 well developed, ends in a very long point (e). 



Ophiopteron elegans has been found in a number of localities in 

 the Indian Ocean, in the Sunda Archipelago, in the Andaman, 

 Laccadive, and Maldive Islands, and on the Macclesfield Bank, but 

 it is always rare and has never been taken except in very small num- 

 bers. 



OPHIOPTERON GRATUM, new species. 



Plate 60, figs. 3, 4 ; plate 103, fig. 2. 



Locality. Albatross station 5152; Sulu (Jolo) Archipelago, Tawi 

 Tawi Group; Pajumajan Island (W.), bearing S. 2 W., 3.70 kilo- 

 meters (2 miles) distant (lat. 5 22' 55" N., long. 120 15' 45'-' E.) ; 

 62 meters (34 fathoms) ; February 18, 1908: wh. S. 



One specimen (Cat. No. 41307, U.S.N.M.). 



. 



