A MONOGRAPH OF THE EXISTING CRINOIDS 565 



from the list of species assigned to Dichrometra when that genus was established in 

 1909, but it was included in the list of names under Dichrometra in my revision of the 

 family Mariametridae published in 1913. 



In 1915 I included the name Dichrometra dofleini, a nomen nudum, in a list of the 

 comatulids occurring along the coasts of China and Japan. The specimen upon which 

 the new name was based was one that had been collected by Prof. Franz Doflein, who 

 had kindly sent me for study his entire collection of Japanese comatulids. The depth 

 of the habitat was given as 83 fathoms. 



In 1916 Dichrometra dofleini was formally described from the specimen mentioned 

 above. 



In my report on the unstalked crinoids of the Siboga expedition published in 1918, 

 the name gotoi appeared in the key to the species of Dichrometra. The name Dich- 

 rometra gotoi was based upon the type specimen of D. dofleini, so that gotoi is a pure 

 synonym of the earlier dofleini. In a footnote under the name doderleini in this same 

 key, Antedon stylifer is erroneously given as a synonym. 



In 1936 Dr. Torsten Gisl^n recorded a specimen from Cochinchina, greatly ex- 

 tending the known range of the species. 



DICHROMETRA CILIATA A. H. Clark 



PLATE 57, FIGURES 263, 264; PLATE 58, FIGURES 265-268 



Dichrometra ciliata A. H. CLARK, Crinoids of the Indian Ocean, 1912, p. 319 (detailed description; 

 off Gopalpore, 30-38 fathoms; compared with D. flagellata); Proc. Biol. Soc. Washington, vol. 

 26, 1913, p. 144 (listed), vol. 29, 1916, p. 106 (most nearly related to D. dofleini); Unstalked 

 crinoids of the Siboga Exped., 1918, p. 105 (in key; range); Rec. Indian Mus., vol. 34, pt. 4, 

 1932, p. 551 (listed), p. 558 (Investigator station 549; notes). GISLEN, Kungl. Fysiogr. Sallsk. 

 Handl., new ser., vol. 45, No. 11, 1934, p. 25. 



Diagnostic features. The lower pinnules are slender, P 2 and P 3 being composed of 

 segments that from the fifth onward are longer than broad, becoming three times as 

 long as broad distally; P] is 11.5 mm. long, with 29 segments; P 2 is 17 mm. long, with 

 34 segments; P 3 is 18.5 mm. long, with 31 segments; the cirri are XXVII, 29-35 

 (usually about 33), 30 mm. long; small but prominent dorsal spines are developed 

 from the tenth-thirteenth segment onward; the 34-42 arms are 110-120 mm. long. 



Description. The centrodorsal is moderate in size, with the dorsal pole concave, 

 2 mm. in diameter. 



The cirri are XXVII, 29-35 (usually about 33), 30 mm. long. Small but promi- 

 nent dorsal spines are developed from the tenth to thirteenth segments onward. 



The 34-42 arms are 110 to 120 mm. in length. The division series and arms 

 resemble those of D. flagellata but are smoother and without any trace of synarthrial 

 tubercles. 



PI is 11.5 mm. long, very slender, with 29 segments, of which the second and third 

 are about as long as broad, the fourth tapers somewhat distally, and the fifth and 

 following are half again as long as broad, soon becoming twice as long as broad and 

 three tunes as long as broad distally. P 2 is 17 mm. long, no stouter than P] basally 

 but tapering more gradually, very slender, slightly stiffened, with 34 segments, of which 

 the third is about as long as broad, the fifth is half again as long as broad, the tenth is 

 twice as long as broad, and the terminal are three tunes as long as broad. P 3 is 18.5 



