MONOGRAPH OF THE EXISTING CRINOIDS. 725 



Hathrometra sarsii. Lively light grayish brown, with narrow darker bands. 

 Tricfi&metra vexator. Yellow. 



Trichometra isis. Yellowish brown, the dorsal surface and cirri lighter. 

 Thaumatometra tenuis. (a) Light purplish brown, lighter dorsally; cirri 

 nearly white. 



(b) Light yellow brown (young). 



Family PENTAMETROCRINID^E. 



Thaumatocrinus borealis. Purplish brown, dorsally nearly white; disk black. 



'Pentametrocrinus varians. Dull purplish brown, the dorsal surface and the 

 cirri nearly white, the disk black. 



Pentamctrocrinus japonicus. Practically the same as P. varians. 



Pentam-etrocrinus diomedem. Not distinguishable from P. japonicus. 



In addition to the definite records given above the colors of a number of un- 

 determined comatulids have been recorded. 



Leach in 1815 gave a colored figure of his Alecto horrida. 



Savile-Kent says that the variety of hues exhibited by the Barrier Reef species 

 are legion, running through every gradation of tint from pale yellow to rose-pink, 

 deep crimson and black, and including every conceivable intermixture of those 

 colors. One especially handsome form obtained at Thursday Island had its fern- 

 like arms resplendent with shades of old gold and bronze green. He gives two 

 colored figures. 



Captain Parfait records sulphur yellow comatulids from latitude 33 47' N., 

 longitude 11 23' E., in 1,635 meters (probabaly Thalassometrinae). 



Professor Nutting says that on the " Pentacrinus grounds " off Habana bright 

 yellow comatulids were fairly abundant, and white or nearly white ones were also 

 secured. It occurred to him that Lieutenant-Commander Sigsbee may have had 

 these in mind when giving the colors of the pentacrinites. 



The same author states that at Barbados the masses of coral rock within which 

 he found comatulids were often brilliantly colored by the assemblage of corallines, 

 sponges, and gorgonians with which they were overgrown. The predominating 

 colors of these were red and yellow, and these were the predominating colors of the 

 comatulids also. 



He mentions the following colors as occurring among the comatulids at Bar- 

 bados: yellow and white, yellow and red, purple and white, black arms with yel- 

 lowish pinnules, rich deep vermillion with bright yellow pinnules, lemon yellow 

 with the dorsal surface of the arms black, grayish, violet, crimson, black with 

 greenish yellow arms, magenta with dark yellowish arms, and dark gray, almost 

 black, with whitish cirr 1 '.. The species represented were Nemaster iowensis, Nemas- 

 ter discoidea, Leptonemaster venustus, Comactinia meridionalis, Analcidometra 

 armata, and Coccometra hagenii. 



Speaking of the coloration of the deep-sea animals dredged between Central 

 America and the Galapagos Islands, Mr. Alexander Agassiz said that there are a 

 number of forms in which yellows prevail, as, for instance, in the comatulids 



