A MONOGRAPH OF THE EXISTING CRINOIDS 539 



brachials, but gradually become stouter. Those following slowly increase in length 

 to near the end of the arm, but they are always much shorter than the lowest pinnules. 



The earlier pinnules bear a well-marked terminal comb which disappears after 

 about the tenth brachial. 



The disk is 35 mm. in diameter. The mouth has no very definite position. 

 Between it and the anal tube there are a few calcareous granules. 



The color in alcohol is light brown. 



Carpenter believed this fine specimen to be specifically identical with one in the 

 Bonn Museum and another in the Paris Museum. The former, without locahty, was 

 mentioned by Miiller in 1849, and the latter was one of the three referred to by 

 Lamarck under the name of Comatula multiradiata. He said that this type is very 

 similar to bennetti, but differs in having fewer cirri, and in the segments composing 

 them being tolerably uniform in size. The brachials are relatively shorter, while 

 both the first and the subsequent intersyzygial intervals are longer than in bennetti. 

 The pinnules, which have stouter and shorter segments, are more clothed with 

 perisomc. 



The specimen from the Moluccas collected by P6ron and Lesueur in 1803 is of 

 medium size. It has 56 arms, and the cirri are composed of 26-29 segments. 



The specimen from the Danish expedition to the Kei Islands station 20 has 80 

 arms about 160 mm. long. All of the division series are 4 (3 + 4). The cirri are 

 XXVII, 30-32, up to 40 mm. in length. 



The specimen from Siboga station 133 I at first considered as representing a new 

 species which I described under the name of Comanthus crassicirra. It is evidently 

 very immature, for the irregularity in the numbers of the arms on the different rays 

 indicates that it is undergoing adolescent autotomy. 



The centrodorsal is flattened hemispherical, small, with a flat dorsal pole 2 mm. 

 in diameter. The cirrus sockets are arranged in one and a partial second irregular 

 marginal rows. 



The cirri are XVII, 17-24, from 15 to 24 mm. long, and are large and stout. 

 The first segment is short, and those following increase in length to the fourth, which 

 is nearly or quite as long as broad, and still further increase to the fifth and sixth or 

 sixth and seventh, which are the longest, nearly or quite half again as long as broad. 

 The succeeding segments gradually decrease in length so that the last 8 or 10 are 

 slightly broader than long. On the fully developed cirri, which are evidently not of 

 the type wliich the animal will possess when adult, the twelfth or thirteenth and 

 following segments have small subterminal dorsal tubercles. The shorter distal 

 segments are slightly compressed laterally and have a pohshed surface, though this 

 begins gradually without a transition segment. The opposing spine is small, low, 

 and broad, median or subterminal. The eariier cirri have slight dorsal processes, 

 and this led me to consider this specimen as representing a species near C. japonica. 

 But the latter cirri appear to be quite without them. In very young C. japonica the 

 young cirri possess very strong dorsal processes. 



Deep but very narrow subradial clefts are present. 



The mouth is interradial and submarginal. The anal tube is central. 



