540 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



The distal pinnules are 8 mm. long, with about 18 segments, of which the first 

 two are short, the third and fourth are longer than broad, and the remainder are about 

 twnce as long as broad, all with thorny distal ends. 



The pinnule ambulacra are bordered with rodhke side plates, three to each seg- 

 ment. These are mostly simple smooth rods, but they may have forked or perforated 

 ends; at the ends of some pinnules they are shorter and have a difTerent and more 

 platelike form. Strongly knobbed spicules occur in the tentacles. 



SaccuU are numerous and conspicuous along the pinnule ambulacra. 



The disk is concealed. 



In life the proximal half of the animal, including the cirri, was orange yellow; 

 distally the arms and pinnules were much banded with delicate gray, producing a 

 dark effect. In the cirri the first four or si.x segments were lighter than the remainder, 

 and on many cirri the eighth to tenth segments were much darker than the others, 

 being rusty yellow. 



Locality. — Discovery Investigations station 1955; north of the South Shetland 

 Islands (lat. 61°35'06" S., long. 57°23'18" W.); 440-410 meters; January 29, 1937 

 [John, 1938] (1, B.M.). 



IeuMORPHOMETRA HIRSUTA (P. H. Carpenter)* 



Figure 29, c-e 



Anledon hirsula P. H. Carpenter, Challenger Reports, Zool., vol. 26, pt. 60, 1888, p. 188 (description; 

 Bta. 145) ; pi. 31, fig. 5.— Hartlaub, Bull. Mus. Comp. Zool., vol. 27, No. 4, 1895, p. 143 (range.).— 

 Bather, Gcol. Mag., Dec. 4, vol. 3, 1897, p. 120 (pinnules compared with those of Millericrinus 

 recubariensis) . — DSderlein, Fauna Arctica, vol. 4, Lief. 2, 1905, p. 405 (antarctic representative 

 of the Tenelta group). — Hamann, Bronn's Klassen und Ordnungen des Tier-Reichs, vol. 2, Abt. 

 3, 1907, p. 1579 (listed).— A. H. Clark, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 353 

 (listed); Crinoids of the Indian Ocean, 1912, p. 33 (of P. H. Carpenter, ISSS= Thaumatometra 

 hhsuta); Die Crinolden der Antarktis, 1915, p. 105 (species so recorded by Andersson is an 

 IsomelTo). — Obsrima and Ikeda, Proc. Imper. Acad. Japan, vol. 10, No. 2, 1934, p. 127 (alleged 

 copulation; notice of Andersson, 1904). 



Thaumalomelra hirsula A. 11. Clark, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 128 (Usted); 

 Crinoids of the Indian Ocean, 1912, p. 33 { = Anledon hirsula P. H. Carpenter, 1888); Smithsonian 

 Misc. Coll., vol. 61, No. 15, 1913, p. 66 (published references to specimens in the B.M.; Challenger 

 sta. 145). 



Eumorphometra hirsvla A. H. Clark, Journ. Washington Acad. Sci., vol. 5, 1915, No. 3, p. 81 (antarctic; 

 range) ; Die Crinolden der Antarktis, 1915, p. 106 (collected by the Challenger; recorded as Anledon 

 hirsula), p. 107 (in key to antarctic crinoids), p. 118 (synonymy; range), p. 119 (comparison with 

 E. concinna), p. 168 (a shallow water antarctic species confined to the Gauss quadrant and adjoin- 

 ing islands; range), p. 169 (relationships), p. 192 (further discussion); Unstalked crinoids of the 

 Siboga-Expcd., 1918, p. 232 (in key; range; references). — GiSLiiN, Ark. Zool., vol. 19, No. 32. 

 1928, p. 10 (notes). — John, Discovery Reports, vol. 18, 1938, p. 124 (Marion Island), p. 159 (notes 

 on the type specimen). 



Diagnostic features. — When the arm length is about 35 mm. there are about 

 XL cirri, of which the interradial ones tend to be in distinct columns; the cirri have 

 25 to 30 segments; the division series exhibit no sjTiarthrial tubercles, the IBr, having 

 an almost straight distal edge; though slightly flared the proximal ossicles are not 

 prominently spinous; P, and Pj have the distal segments elongated; Pj is a httle smaller 

 than P,. 



See also Addenda (p. 837) under 1963. 



