224 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Beyond the third segment the pinnule becomes rounded triangular, and the distal 

 dorsal edge of the segments is prominent, though not excessively produced. P< is 

 slightly smaller and more delicate than P 3 with about the same number of segments 

 which are proportionately longer distally. The pinnules following are similar, grad- 

 ually becoming longer and more slender with longer segments. The rounded triangu- 

 lar condition of the distal portion of the pinnules is traceable to about the end of the 

 proximal third of the arm. The distal pinnules are about 5.5 mm. long, exceedingly 

 slender, with about 20 segments of which the first is trapezoidal, about twice as broad 

 as long, the second is trapezoidal, about as long as the proximal width, the third is 

 slightly longer than broad, and the remainder are elongated with swollen articulations, 

 distally three tunes as long as broad or even somewhat longer. 



The color in alcohol is white with small bands and patches of light brown on the 

 arms, the distal half of the cirri becoming brownish. Other specimens are white 

 similarly marked with deep violet, or entirely deep purple, sometimes with the two 

 proximal pinnule pairs white, or occasionally brown ; small specimens are yellow. 



In the lot of eight specimens from Singapore six resemble the type specimen of 

 pulchella. One is small with arms 40 mm. long, but otherwise similar to the type, and 

 one is young with arms 13 mm. long and the cirri LX, 8-10, 3 mm. long. In the last 

 the segments of the lower pinnules are elongate and do not exhibit the distally serrate 

 condition so characteristic of the adults. 



In another lot of 20 specimens from Singapore 12 are large, resembling the type 

 specimen of pulchella, and 8 are small. Eight of the individuals, seven large and one 

 small, were attached to a small sprig of a gorgonian. 



Of the remaining specimens from Singapore three have the arms 65 mm. long. In 

 some the lateral processes on the segments of P 2 are very slightly developed, and they 

 may be reduced to a scarcely perceptible production of the distal ends of the segments 

 at the prismatic angles. 



The specimen from the Arrakan coast of Burma is small and immature. 



The specimens from Investigator station 19, off Puri, were originally considered as 

 representing a new species, Oligometra concinna, which was thus described: 



The centrodorsal is thin discoidal with the bare polar area flat, 2 mm. in diam- 

 eter. The cirrus sockets are arranged in a single closely crowded, though fairly 

 regular, marginal row. The cirri are rather slender, relatively short, XIII-XVII, 

 19-21, 8 mm. long. The first segment is very short and those following slowly 

 increase in length to the seventh or eighth which, with the remainder, is from as 

 long as, to half again as long as, broad. The proximal segments are abruptly flattened 

 ventrally; on the fourth or fifth the distal dorsal edge is slightly prominent, forming 

 a low finely serrate transverse ridge across the end of the segment; on the succeeding 

 segments this ridge increases in height and moves anteriorly, on the twelfth and 

 following being median hi position; distally the ridge very gradually narrows, becom- 

 ing finally, on the antepenultimate, reduced to a sharp median tubercle. The oppos- 

 ing spine is much larger than the spine on the preceding segment, sharp, arising from 

 the entire dorsal surface of the penultimate segment, the apex median in position, 

 equal to about the distal width of the penultimate segment in height. The terminal 

 claw is longer than the penultimate segment, stout, more strongly curved proximally 

 than distally. The distal border of the radials is even with the rim of the centro- 



