266 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Diagnostic features. The cirri are XVIII-XX, 9-12 (usually 9), from 4 to 

 6 mm. in length; the longest cirrus segment is three times as long as the width of its 

 proximal end, or slightly longer. The arms are from 30 to 40 mm. long and resemble 

 those of C. parvula. The comb on PI consists of 9-11 long teeth, which are somewhat 

 longer, narrower, and more pointed than the teeth in the combs of C. parvula. Combs 

 occur only on PI and P2. 



Description. The centrodorsal is large, discoidal, with a broad flat dorsal pole 

 2 mm. in diameter. The cirrus sockets are arranged in a single very closely crowded 

 marginal row. 



The cirri are lacking in the type specimen ; in a smaller specimen from the same 

 locality the cirri are XX, in one and a partial second marginal row, the latter appar- 

 ently undergoing suppression; there are also traces of the sockets of a third row. The 

 cirri have 9 segments, and are from 4 to 4.5 mm. long. The first segment is nearly 

 or quite twice as broad as long, the second is slightly longer than broad, the third is 

 about three times as long as the diameter of the proximal end, and the fourth slightly 

 longer. The fifth is about as long as the third, the sixth is about twice as long as the 

 diameter of the distal end, and the seventh is slightly shorter. The antepenultimate 

 is half again as long as broad, and the penultimate is about as long as broad. The 

 longer earlier segments are slightly constricted centrally with expanded ends. The 

 dorsal processes on the outer segments are almost obsolete. 



Arms 10, from 30 to 35 mm. long, resembling those of C. parvula. P! is 7 mm. 

 long, bearing a terminal comb consisting of 1 1 long teeth. 



The mouth is central or subcentral, and the anal tube is marginal or submarginal. 



Notes. The type specimen is the larger of the 2 individuals from Siboga station 

 267. 



The largest of the 6 examples from Siboga station 266 has the arms 40 mm. 

 long; the cirri have been lost. 



In one of the 2 specimens from Bock's station 35 the centrodorsal is 2 mm. in 

 diameter, with the bare dorsal pole 1.3 mm. in diameter. The cirri are arranged in 

 a single row. 



The cirri are XVIII, 9-12, from 4 to 6 mm. in length. The third segment is 

 three tunes as long as broad, and the fourth, which is a transition segment, is twice 

 as long as broad. The antepenultimate segment is half again as long as broad. 



The radials and the IBr! are almost completely concealed by the centrodorsal. 

 The IBr 2 (axillaries) are triangular, three times as broad as long^. 



The 10 arms are 35 mm. in length. The first brachials are four times as broad 

 as long, interiorly united, very closely articulated with the second brachials which 

 are twice as broad as long exteriorly. The width of the brachials in the middle of 

 the arms is 0.6 mm.; there are 16 brachials for each 10 mm., or 12 if the syzygial pairs 

 are counted as single units. The longer side of the distal brachials is one-third 

 greater than the length. 



PI is 5 mm. long with 25-27 segments, of which 9-11 bear teeth and are involved 

 in the formation of the terminal comb. P 2 is composed of 23 segments, of which 11 

 bear teeth. The teeth are somewhat longer, narrower, and more pointed than the 

 teeth in the combs of C. parvula. P 3 is 3 mm. long with 16 segments, without a comb. 



