A MONOGRAPH OF THE EXISTING CRINOIDS 



249 



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Diagnostic features. The size is large, though not so large as in C. magnifica, 

 the arms being from 100 to 120 mm. in length; there are only XIII-XV cirri, which 

 have 25-30 segments. 



Characters of the type specimen. The cirri are XIII, 25-30 (usually nearer the 

 latter), 20 mm. long. Professor Bell notes that the fifth and sixth segments seem 

 to be distinctly the longest. The fifth is a transition segment. 



The 10 arms are 120 mm. long. The synarthrial tubercles are only slightly 

 evident. The distal edges of the brachials are moderately produced and finely 

 spinous. 



According to Professor Bell the first syzygy is between brachials 3 + 4, the 

 second is between brachials 12+13, and the third is between brachials 20 + 21. 

 The distal intersyzygial interval is 3 muscular articulations. 



There is a great development of small spines, especially on the pinnule seg- 

 ments, so that the animal has a curiously "dry" feeling. 



The color in alcohol is brownish. 



Notes. In the type specimen of Comissia dumetum the cirri are XV, 26-27, 

 from 15 to 17 mm. in length. Compared with the cirri of C. liitkeni they are more 

 slender, with the longer proximal segments somewhat more strongly constricted 

 centrally and the distal segments with the dorsal processes slightly more pronounced. 



The 10 arms are about 100 mm. long. 



The pinnules resemble those of C. liitkeni, but the distal ends of the segments 

 are more prominent and more spinous, and the dorsal surface is much more spinous. 

 The spine at the ventral distal angles of the segments of the middle and distal 

 pinnules is much longer than the corresponding spine in C. liitkeni and somewhat more 

 slender; on the outer segment its length is equal to the width of the segment 

 bearing it; it may be more or less branched, especially at the tip. 



The color is olive green, the cirri blotched with lighter. 



Localities. Macclesfield Bank, west of Luzon, Philippines; 100-110 meters 

 [Bell, 1894; A. H. Clark, 1912, 1913, 1918] (1, B. M.). 



Albatross station 5356; north Balabac Strait, Philippines; Balabac Light bearing 

 S. 64 W., 15.5 miles distant (lat. 8 06' 40" N., long., 117 18' 45" E.); 106 meters; 

 temperature 27.78 C.; sand and shells; January 5, 1909 [A. H. Clark, 1911] (10, 

 U.S.N.M., 27484, 34936, 34943). PI. 24, fig. 65. 



Remarks. Bell's original description published in 1894 is indefinite and in part 

 inaccurate. I reexamined his type specimen in London in 1910 and published notes 

 upon it in 1913. 



There can, I think, be no doubt that my Comissia dumetum described in 1911 

 is the same as Bell's Actinometra peregrina. 



COMISSIA LttTKENI A. H. Clark 



Plate 24, Figs. 66, 67 

 [See also vol. 1, pt. 2, fig. 242 (arm), p. 197] 



Comaster coppingeri (part) A. H. CLARK, Smiths. Miscell. Coll., vol. 52, pt. 2, 1908, p. 202 (Alba- 

 tross station 5153; 10-armed specimens). 

 9729831 17 



