A MONOGRAPH OF THE EXISTING CRINOIDS 149 



P. Pi and P. rounded triangular, distal edges of segments everted and spinous all around 

 dorsal side, this being slightly, if at all, accentuated at prismatic angles (Andaman 



to Lesser Sunda and Kei Islands; 73-90 meters) omatus (p. 172) 



e 2 . Edges of ossicles of IBr series and earlier brachials only slightly, if at all, everted, so 

 that dorsal profile of earlier portion of arms is smooth. 

 P. Third segment of P, and P. not longer than broad (Bonin and Philippine Islands and 

 the Macclesfield Bank to Moluccas and Kei and Lesser Sunda Islands; 36-183 



meters) indivisus (p. 163) 



P. Third segment of Pi and P. half again as long as broad. 



g*. P„ and P 2 scarcely longer or slenderer than other proximal pinnules; arms up to 40 

 mm. in length and cirri up to 7 mm. in length (Bonin Islands; 712S-1S3 meters) 



pulchellus (p. 177) 



g 2 . P a and P 2 markedly longer than succeeding pinnules; arms 55 mm. and cirri 9 mm. 



long (Maldive Islands to Burma and Kei Islands; 73-89 meters). gracilis (p. 175.) 



b 2 . Cirri stout and strongly curved, none of component segments appreciably longer than broad. 



c 1 . P. and P 2 , though elongated and stiffened, are slender like the succeeding pinnules and not 



enlarged; third and fourth segments are half again as long as broad and outer are 3 or 4 



times as long as broad. 



d l . P. and P 2 are one-third or one-fourth again as long as succeeding pinnules and are composed 



of 16 or 17 segments (Lesser Sunda to Kei and Philippine Islands; 46-85 meters) 



pinnatus (p. 153.) 

 <i 2 . P. and P 2 are not longer than succeeding pinnules and are composed of 11 segments 



(Bonin Islands; ?146 meters) loveni (p. 156.) 



c 2 . P. and P 2 are enlarged as well as stiffened; they are composed of 11 or 12 segments of which 

 first 4 are broader than long and outer are about twice as long as broad (southern Japan ; 

 110 meters) variegatus (p. 157) 



EUDIOCRINUS JUNCEUS A. H. Clark 



Plate 10, Figures 35, 36 

 [See also vol. 1, pt. 1, fig. 83 (side view), p. 136; pt. 2, fig. 788 (ambulacral deposits), p. 366.] 



Eudiocrinus junceus A. H. Clark, Proc. Biol. Soc. Washington, vol. 25, 1912, p. 25 (description; 

 Siboga station 167); Amer. Journ. Sci., vol. 40, 1915, p. 62 (listed); Unstalked crinoids of the 

 Si&osa-Exped., 1918, p. 64 (in key; range), p. 65 (references; detailed description; Sta. 167), 

 fig. 3, p. 66, p. 273 (listed), pi. 17, figs. 31, 32; Smithsonian Misc. Coll., vol. 72, No. 7, 1921, pi. 2, 

 fig. 20 (ambulacral deposits) ; Rec. Indian Mus., vol. 34, pt. 4, 1932, p. 556 (compared with 

 E. philenor). 



Diagnostic features.— The long tapering cirri with elongated segments and the 

 greatly enlarged and slowly tapering P a and P 2 easily distinguish this species from 

 all the others in the genus. 



Description. — The centrodorsal is discoidal, moderately thick, the sides converging 

 rather strongly; the flat dorsal pole is 1.0-1.5 mm. in diameter. The cirrus sockets 

 are arranged in two closely crowded and irregular rows. 



The cirri are XXV, 22, 23 mm. long, greatly elongated with elongate segments, 

 very slender, tapering from the base to the tip, rather more strongly in the first three 

 or four segments than subsequently. The first segment is short, the second is not so 

 long as broad, the third is nearly or quite twice as long as the proximal diameter, the 

 fourth is about four times as long as the median diameter, and the sixth, seventh, and 

 eighth are very slightly longer. From this point onward the length almost imper- 

 ceptibly decreases so that the seventeenth and following segments are slightly over 

 twice as long as broad. The penultimate segment is half again as long as broad, 



