A MONOGRAPH OF THE EXISTING CRINOIDS 353 



and the distal claw of this young specimen, while possessing the characteristic curva- 

 ture of the species, has the abrupt curvature of the proximal portion continued into 

 the slender distal portion. The synarthrial tubercles are present, but are less pro- 

 nounced than in the larger specimen [not shown in any of the figures]." The pinnules 

 are said to have the typical structure. Miss Boone says, presumably of the largest 

 specimen, that "the proximal pinnules all have squarish articles and conform to the 

 type description in essentials. P, is slender, 7.1 mm. long, with 20 articles; P a is 7 

 mm. long, less slender, with 17 (rarely 18) articles; P 3 is 5 to 5.5 mm. long, like P 2 , 

 but with only 16 articles; P 4 is 5 mm. long, consisting of 13 articles, less thick than P 2 

 and P 3 , but not so slender as P,." Miss Boone said that "Mr. Vanderbilt's field note 

 records these living sea-lilies as brown with yellow markings. Under the microscope 

 the specimens, now preserved nine years in alcohol, show the disk and pinnae as deep 

 purplish brown, the arms and cirri a deep ivory yellow. The apical spines of the 

 pinnae show as crystalline hooks." 



Grube described Comatula laevissima from North Borneo as follows: This is a 

 strikingly smooth species with 10 arms 74 mm. long consisting of about 150 brachials, 

 and a low convex centrodorsal on the margin of which the cirri are arranged in two 

 rows. The cirri are XVI-XVII, 24-26. The radials are concealed. In one speci- 

 men the IBr 2 (axillaries) have mostly a rather sharp dorsal tubercle, and for the 

 most part are syzygial. The brachials have oblique ends and are about as long 

 as broad or broader than long. Syzygies occur between brachials 3+4, 9 + 10 (or 

 10 + 11), 16 + 17, 23+24 (or 24+25), 30+31 (or 31+32), and 39+40 (or 40+41, or 

 37+38); the distal intersyzygial interval is 10 or 11 muscular articulations. From 

 brachial 118 onward syzygies become very scarce, or are entirely lacking. PI is very 

 slender and short. The following pinnules are much thicker and longer, sometimes 

 up to 10 mm. long, though often much shorter. The number of the segments, which 

 are elongated, is up to 19. One specimen is entirely flesh colored. A second is 

 banded with violet on each brachial. The perisome of the latter is raised into six high 

 blunt soft tubercles of the same length as the anal tube which lie at the base of six 

 adjoining arms. 



Professor Schneider, Grube's successor at Breslau, sent the two specimens of 

 Comatula laevissima to Dr. P. H. Carpenter for examination. Carpenter said that 

 they agree pretty closely in the characters of their cirri, and in their short brachials ; 

 but, as is indicated in Grube's description, their color is altogether different, while 

 one of them has a tubercular junction between the elements of the IBr series and 

 also between the first two brachials, which is altogether absent in the other individual. 

 In the latter, too, the segments of the lower pinnules are sharply carinate. This is 

 not the case in the former, which Carpenter found to be a small individual of what 

 he called Antedon milberti. He said that Grube's name will therefore apply only to 

 the other specimen, which he proposed to describe more fully at a future time, though 

 he was never able to do this. This second specimen undoubtedly represents a species 

 of Decametra, possibly D. mylitta (see Part 4b). 



The specimen collected by Dr. Mortensen off Jolo is small and young. 



Carpenter's description of Antedon milberti in the Challenger report was based 

 upon the specimens from Challenger stations 203 and 212. He said that the centre- 

 dorsal is hemispherical. The cirri are XX-XXX, 25-35, or even nearly 40. Most of 



