330 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



The cirri are X, 22-23 ; the first segment is very short and those following increase 

 in length to the fourth, which is about as long as broad, the remainder being tolerably 

 equal and longer than broad. The penultimate bears a well-marked opposing spine. 



The radials are visible. The IBri are trapezoidal, closely united laterally and 

 broadest along the distal edge where they are united by syzygy to the IBr 2 (axillaries), 

 which are triangular and more than twice their length. 



The 10 arms are about 150 mm. in length and are composed of 130 + brachials. 

 They increase in width only slightly from the base. The first 2 brachials are united 

 by syzygy. The first brachials are closely united interiorly and are shorter interiorly 

 than exteriorly, the exterior length being two-thirds the width. The next 5 or 6 

 brachials are more oblong with slightly developed articular tubercles. The following 

 brachials are triangular with convex proximal and concave distal edges, twice as 

 broad (nearly 5 mm.) as long, becoming more quadrate toward the arm ends. The 

 lower and middle parts of the arms have a faint slightly raised mediodorsal line. 



Syzygies occur between brachials 1+2, 3 + 4, about 12+13, and distally at 

 intervals of from 4 to 6 muscular articulations. 



P! and P are both about 20 mm. long and consist of about 40 segments, of which 

 the lowest 5 or 6 are wide and stout, with prominent dorsal edges but no distinct 

 keels. The next 2 pinnules on either side are of decreasing length and stoutness; 

 they have the second and third segments wide, with strong and expanded dorsal 

 keels. The fourth pair, though somewhat shorter than the third, are considerably 

 stouter, with broader and more massive segments and large gonads. The following 

 pinnules are somewhat longer and tolerably equal, decreasing again after about the 

 twenty-fifth brachial, but remaining stiff throughout and never becoming especially 

 slender. The lower and middle segments of these pinnules until far out on the arms 

 are very broad, reaching nearly 2 mm., and have sharpened dorsal edges. The 

 middle segments of the pinnules do not become elongated until about the eightieth 

 brachial. The terminal comb is found only on PI, P 2 , and P 3 and the corresponding 

 inner pinnules. 



The disk is 15 mm. in diameter, naked, with a radial mouth. 



The color in alcohol is brownish white, each arm with a narrow light mediodorsal 

 band flanked on either side by a broad reddish-brown stripe. 



A specimen from Singapore in the Hamburg Museum is similar to the one just 

 described from Hong Kong, but slightly more slender. There are 21 cirrus seg- 

 ments. There is a similar specimen from Singapore in the British Museum. 



These and the individual from Hong Kong resemble the slender form of Comatula 

 pectinata, except for the much greater size and much larger number of cirrus seg- 

 ments. They have not the broadly expanded arms and stout cirri of the Australian 

 individuals (the so-called robusta), nor are the arms so flat dorsally. Both are in color 

 light brown with a fine mediodorsal line of white and white borders to the arms. 

 The Hong Kong specimen has III cirri and the one from Singapore II and 2 stumps. 

 In both the centrodorsal is undergoing reduction. 



The 3 specimens from Billiton in the British Museum are all of the slender- 

 armed type and resemble those from Hong Kong and Singapore noticed above. 



