296 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Notes. — These specimens agree well with those from the Siboga 

 expedition; they are all of small size, and the diameter of the disk 

 does not exceed 5 mm. I do not find in them variations comparable 

 to those which I have recorded in the specimens of O. fulgens from 

 the Siboga and Albatross collections, excepting in regard to the 

 number of the small spines which may be met with on the upper arm 

 plates, spines the presence of which is more constant here than in 

 O. fulgens. These spines are more or less numerous ; they are always 

 very small, very short, and terminated by a few extremely fine di- 

 verging points. The outlines of the upper arm plates, even on the 

 dried specimens, are sometimes less apparent than in O. fulgens, as 

 may be seen in the individual of which I include a photograph (pi. 

 37, fig. 6) and which is from the Siboga collection, while these out- 

 lines are very clearly shown in the specimen from station 5132, of 

 which a photograph is given in figure 5. The breaking up of these 

 plates is, generally speaking, very much less marked in O. pulchella 

 than in the other species of the genus ; the broken plates occur only 

 on the first arm segments, and the fragments, delimited by one or 

 two grooves only, are always few in number. 



The tentacle scale, a little more developed than in O. fulgens, is* 

 however, of rather small size; I give a photograph of it (pi. 103, 

 fig. 5/). As in O. fulgens, this scale disappears at a short distance 

 from the disk. 



Ophiogymna pulchella was found by the Siboga in a few localities 

 in the Sunda Archipelago at depths between 73 and 247 meters (40 to 

 135 fathoms) ; one specimen from Amboina, without a record of the 

 depth, was undoubtedly collected at low tide. 



OPHIOCNEMIS M ARMOR ATA (Lamarck). 



See for bibliography: 



Ophiocnemis marmorata Kcehleb ('05), p. 112; ('07), p. 339. — Macintosh: 

 ('11), p. 166.— H. L, Clark ('15), p. 283; ('15a>), p. 90. 



Locality. — Albatross station 5421; between Panay and Guimaras; 

 Lusaran Point Light bearing S. 27° E., 9.27 kilometers (5 miles) 

 distant (lat. 10° 33' 30" N., long. 122° 26' 00" E.) ; 250 meters 

 (137 fathoms) ; March 30, 1909; gn. M. 



One specimen (Cat. No. 41178, U.S.N.M.). 



Notes. — The single specimen is of small size, the diameter of the 

 disk being only 7 mm. 



OpMocnemis marmorata is very widely distributed over the whole 

 Indo-Pacific region ; it is known from Zanzibar, Ceylon, the Mergui 

 Archipelago, Singapore, the Sunda Archipelago, the coast of north- 

 western Australia, etc. 



