OPHIURANS OF THE PHILIPPINE AND ADJACENT WATERS. 351 



The first under arm plates are entirely covered by granules, as 

 I have stated above, and their outlines are quite hidden : these gran- 

 ules may extend as far as the fifth plate. The following plates are 

 hexagonal, a little longer than broad, with three short proximal 

 borders, two sides notched by the tentacle pores, and a rounded 

 distal border; they are at first in contact. At some distance from 

 the disk the three short proximal sides become converted into an 

 acute angle, and the plates become pentagonal, always remaining a 

 little longer than broad, and at the same time they become separated 

 by a narrow interval. 



The side arm plates usually bear six short subequal spines which 

 are a little shorter than half the segment; the three or four first 

 segments have usually seven of them. 



The single tentacle scale is of medium size and oval. 



The color of the specimen in alcohol is light gray with broad light 

 brown annulations on the arms. 



Affinities and distinctive features. The genus Cryptopelta was 

 established by H. L. Clark for Ophiopeza aster Lyman, and he later 

 described a second species, C. granulifera, from a specimen from 

 Mauritius, which was distinguished from C. aster by its flattened 

 arms and different coloration. Cryptopelta tecta seems to me very 

 close to C. granulifera, but it differs from it, as from C. aster, by 

 having its upper and under arm plates longer than broad, by having 

 the granules covering the first under arm plates, and by having the 

 arm spines only six in number except on the first segments. 



OPIHURODON CINCTUS (Brock). 



Plate SI,' fig. 5. 



Ophioconis oincta BROCK ('88), p. 480. K<EHLER ('05), p. 14, pi. 2, figs. 2, 



3. H. L. CLARK ('15), p. 218. 

 Ophiurodon cfoictus MATSUMOTO ('15), p. 84: ('17), p. 315. 



Locality. Albatross station 5147; Sulu (Jolo) Archipelago, in the 

 vicinity of Siasi; Sulade Island (E.) bearing N. 3 E., 15.57 kilo- 

 meters (8.4 miles) distant (lat. 5 41' 40" N., long. 120 47' 10" E.) ; 

 38 meters (21 fathoms) ; February 16, 1908 ; co. S., Sh. 



One specimen. 



Notes. This species was described by Brock in 1888, and two 

 specimens were collected by the Siboga in the Sunda Archipelago, 

 near Timor, at depths between 27 and 54 meters (15 to 30 fathoms). 



In 1905 I recorded a slight difference in the arrangement of the 

 tentacle scales on the first pores in the Siboga specimens and in 

 Brock's type. In the Philippine individual the pores of the first 

 pair show four and even five scales of medium size, as Brock has 

 described ; the pores of the second pair have generally three of them. 



