A MONOGRAPH OF THE EXISTING CRINOIDS 157 



described as E. gracilis pulchellus. But he pointed out that some of the differences 

 between the two are of such a nature as to oblige him to believe that they cannot be 

 due simply to age. He listed the most important differences as follows: The cirrus 

 segment are short, not very much longer than broad, and are not at all or only slightly 

 constricted centrally, as in E. pinnatus and E. variegatus. The proximal segments of 

 P c and Pi bear prominences that are lacking on the corresponding pinnules in E. gracilis 

 pulchellus. In the possession of these prominences it approaches E. venustulus. 

 Eudiocrinus loveni further differs from E. gracilis pulchellus in having the arms, 

 though of about the same length, much stouter, in the more spiny borders of the distal 

 segments of P 2 and P 3 , and in the relatively short distal pinnules. 



Locality. — Dr. Sixten Bock's Expedition to Japan station 47; Bonin Islands, east 

 of the Channel; 146 meters; August 1, 1914 [Gislen, 1922]. 



Remarks. — This species is as yet known only from the single specimen described 

 by Gislen. 



EUDIOCRINUS VARIEGATUS A. H. Clark 



Plate 11, Fio0re 41 

 [See also vol. 1, pt. 2, fig. 127 (arm base), p. 79; fig. 266 (arm), p. 207.] 



Eudiocrinus variegatus A. H. Clark, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 134 (nomen 

 nudum; belongs to same type as E. indivisus and E. granulatus; arm structure); Proc. U. S. 

 Nat. Mus., vol. 34, 1908, p. 277 (listed), fig. 8, p. 277 (centrodorsal and base of an arm), pp. 

 278, 279, figs. 9-11 (description; 34°59' N., 139°34' E., 60 fathoms), p. 307 (recorded); Proc. 

 Biol. Soc. Washington, vol. 25, 1912, p. 27 (compared with E. pinnatus); Crinoids of the Indian 

 Ocean, 1912, p. 102 (synonymy; habitat); Journ. Washington Acad. Sci., vol. 5, 1915, p. 214 

 (southern Japanese species; range and its significance); Amer. Journ. Sci., vol. 40, 1915, p. 62 

 (listed); Unstalked crinoids of the Siboga-Exped., 1918, p. ix (relationship with E. pinnatus), 

 p. 64 (in key; range). — Gislen, Nova Acta Reg. Soc. Sci. Upsaliensis, ser. 4, vol. 5, No. 6, 

 1922, pp. 68, 73 (compared with E. loveni). 



Eudiocrinis variegatus A. H. Clark, Smithsonian Misc. Coll., vol. 60, No. 10, 1912, p. 12 (no locality; 

 description) . 



Diagnostic features. — The cirri are short and stout, with none of the component 

 segments longer than broad; P„ and P 2 are enlarged and are composed of 11 or 12 

 segments of which the first four are broader than long, and the outer are about twice as 

 long as broad. 



This species is distinguished from E. pinnatus and E. looeni, which have similar 

 short, stout, short-segmented cirri, by the stout and short-segmented P a and P 2 . 



Description. — The centrodorsal is discoidal, rather thick, with somewhat con- 

 vergent sides and a broad, flat polar area. The cirrus sockets are arranged in two 

 crowded and more or less irregular rows. 



The cirri are about XXV, 15, from 7 to 9 mm. long. The first segment is about 

 twice as broad as long, and the remainder are about as long as their distal width. The 

 fourth and fifth segments have their distal ends considerably swollen and projecting 

 somewhat dorsally, this feature becoming gradually less and less marked distalh', 

 where the segments are somewhat compressed laterally. There are no dorsal spines. 

 The opposing spine is prominent, erect, and median, arising from the entire dorsal 

 surface of the penultimate segment. The terminal claw is rather stout and well 

 curved and is about as long as the penultimate segment. 



