PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 785 



The intcrradials have a swollen surface, especially distally, but none of them 

 show any indications of an appendage. 



On the arms syzygies occur between brachials 4 + 5, 10 + 11, and 14 + 15. 



The pinnule on the third brachial (P a ) has 13 segments, of which the first is twice 

 as broad as long, the second is slightly broader than long, the third is from a third to 

 a half again as long as broad, and the remainder are about three times as long as broad. 



The five orals are relatively slightly smaller than in the young of T. renovatus 

 described by Carpenter. The perisomic areas are occupied by numerous plates which 

 are largest proximally and in the center of the areas, becoming smaller on the sides 

 and toward the orals. These plates are more or less separated from each other, 

 evidently as a result of a distension of the visceral mass. There is no indication that 

 there ever was any imbrication such as is suggested by Carpenter's figures. The 

 anal tube is conspicuous and cylindrical, and is thickly studded with small plates. 



Localities. Ingolj station 18; southwest of Iceland (lat. 6144' N., long. 3029' 

 W.); 2075 meters; temperature 3.0 C. [A. H. Clark, 1915, 1918, 1921, 1923; Gislen, 

 1924] (40, U.S.N.M., E. 1089; C.M.). Type locality. 



Ingolj station 97; Denmark Strait, between Angmagsalik, Greenland, and north- 

 western Iceland (lat. 6528' N., long. 2739' W.); 823 meters; temperature 5.5 C. 

 [A. H. Clark, 1923] (1, C.M.). 



Remarks. This is the only species of the genus known from the Atlantic, and 

 also the only species which has ever been dredged in quantity. 



It is not absolutely certain that the young individual from Ingolj station 97 

 belongs to this species, though the probabilities are that it does. 



Genus PENTAMETROCRINUS A. H. Clark* 



Ophiocrinus (part) P. H. CARPENTER, Nature, vol. 15, 1877, p. 198; vol. 19, 1879, p. 450; Proc. Roy. 

 Soc., vol. 28, No. 194, 1879, p. 384; Quart. Journ. Geol. Soc., vol. 36, 1880, p. 41 (subgenus of 

 Anledon; all recent material in Carpenter's possession), p. 45 (no basal rays); Bull. Mus. Comp. 

 Zool., vol. 9, No. 4, 1881, p. 161; Journ. Linn. Soc. (Zool.), vol. 16, 1882, p. 494; Phil. Trans. 

 Roy. Soe. for 1883, pt. 3, 1884, p. 919, footnote (preoccupied; name changed to Eudiocrinus) . 

 A. H. CLARK, Proc. U.S. Nat. Mus., vol. 34, 1908, pp. 34, 271 (history and status of the name). 



Eudiocrinus (part) P. H. CARPENTER, Journ. Linn. Soc. (Zool.), vol. 16, 1882, p. 493 (new name for 

 Ophiocrinus Semper, 1868 [not Ophiocrinus Salter, 1856]); Proc. Roy. Soc., vol. 35, No. 225, 1883, 

 p. 138 (comparison with Thaumatocrinus) . PERKIER, Compt. Rend. Acad. Sci., vol. 96, No. 11, 

 1883, p. 725. P. H. CARPENTER, Phil. Trans. Roy. Soc. for 1883, pt. 3, 1884, p. 919 (comparison 

 with Thaumatocrinus), p. 926 (referred to the Comatulidae) ; Challenger Reports, Narrative, 

 vol. 1, pt. 1, 1885, p. 310. PERRIER, Explorations sous-marins, 1886, p. 275. P. H. CARPENTER, 

 Quart. Journ. Micr. Sci., new ser., vol. 27, 1887, p. 385; vol. 28, 1887, p. 308 (homologies with 

 ophiurans); Challenger Reports, Zoology, vol. 26, pt. CO, 1888, p. 73 (general account). BATHER, 

 Proc. London Amateur Sci. Soc., vol. 1, Nos. 1, 2, July 1890, p. 33 (mode of attachment). 

 PERRIER, Trait6 de Zoologie, 1893, pp. 784, 794, 858. BATHER, Proc. Zool. Soc. London, 1895, 

 p. 995 (comparison of base with that of Uinlacrinus) . LAND, Textbook of comparative anatomy, 

 vol. 2, 1896, p. 313. BATHER, in Lankester, A treatise on zoology, pt. 3, Echinoderma, 1900, 

 pp. 135, 137, 195. DELAGE and HEROUARD, Trail6 de Zoologie concrete, vol. 3, 1903, p. 394. 

 MINCKERT, Arch. Naturg., Jahrg. 71, Heft 1, 1905, p. 166 (syzygies; regeneration). HAMANN, 

 Bronn's Klassen imd Ordnungen des Tier-Reichs, vol. 2, Abt. 3, 1907, p. 1575. A. H. CLARK, 

 Proc. U.S. Nat. Mus., vol. 32, 1907, pp. 569, 573; Smithsonian' Misc. Coll., vol. 50, pt. 3, 1907, 

 pp. 343, 344; Proc. Biol. Soc. Washington, vol. 21, 1908, p. 134; Proc. U.S. Nat. Mus., vol. 34, 

 1908, pp. 210, 212, 269, 271, 276. VANEY, Bull. Mus. Hist. Nat., Paris, No. 3, 1910, pp. 160, 



*See also Addenda (p. 836) under 1962. 



