A MONOGRAPH OF THE EXISTING CRINOIDS 249 



GLYPTOMETRA DISTINCTA (P. H. Carpenter) 



Plate 23, Figures 70-72; Plate 24, Figure 73 



[See also vol. 1, pt. 2, figs. 227, p. 183, 245, p. 199, 529, 530, p. 287, 672, p. 335, 760, p. 353, 817, 

 818, p. 385, 819, p. 392, 831-834, p. 405, 856, p. 412.] 



Antedon distincla P. H. Carpenter, Challenger Reports, Zoology, vol. 26, pt. 60, 1888, p. 247 (descrip- 

 tion; Challenger station 210), pi. 51, fig. 1. — Hamann, Bronn's Klassen und Ordnungen des 

 Tier-Reichs, vol. 2, Abt. 3, 1907, p. 15S2 (listed).— A. H. Clark, Crinoids of the Indian Ocean, 

 1912, p. 35 (identity).— Hartlaub, Mem. Mus. Comp. Zool., vol. 27, No. 4, 1912, pp. 285, 306 

 (in Granulijera group; believed synonym of granulifera) . 



Charilometra distincla A. H. Clark, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 361 (listed). — 

 A. H. Clark, Smithsonian Misc. Coll., vol. 52, No. 2, 1908, p. 227 (compared with Ch. smithi). 



Charilometra smithi A. H. Clark, Smithsonian Misc. Coll., vol. 52, pt. 2, 1908, p. 227 (description; 

 Albatross station 5123; also stations 5116, 5198); Unstalked crinoids of the <Si'6oga-Exped., 1918, 

 p. 184, footnote, p. 185 (synonym of distincta). 



Pachylometra distincta A. H. Clark, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 21 (listed); Proc. 

 U. S. Nat. Mus., vol. 39, 1911, p. 554 (comparison with P. [Crossomelra] seplentrionalis) , p. 555 

 (Albatross stations 5510, 5536; characters); Crinoids of the Indian Ocean, 1912, p. 35 (identity), 

 p. 216 (synonymy; localities); Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 48 (published 

 reference to specimen in the B. M.; Challenger station 210); Unstalked crinoids of the Siboga- 

 Exped., 1918, p. 184 (in key; range), p. 185 (synonymy); Smithsonian Misc. Coll., vol. 72, No. 7, 

 1921, pi. 2, fig. 29 (side plates), figs. 30, 31 (side and covering plates). — Gislen, Vid. Medd. 

 Dansk Nat. Foren. K0benhavn, vol. 93, 1933, p. 482; Kungl. Fysiogr. Sallsk. Handl., new ser., 

 vol. 45, No. 11, 1934, pp. 21, 26. 



Pachylometra smithi A. H. Clark, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 21 (listed); Proc. 

 U. S. Nat. Mus., vol. 39, 1911, p. 557 (Albatross stations 5282, 5348; correction of dimensions 

 given in the original description); Crinoids of the Indian Ocean, 1912, p. 220 (synonymy; range). 



Pachylometra selene A. H. Clark, Proc. U. S. Nat. Mus., vol. 39, 1911, p. 556 (description; Albatross 

 station 5523; compared with P. investigatoris) ; Crinoids of the Indian Ocean, 1912, p. 219 

 (synonymy; locality). 



Perissometra selene A. H. Clark, Journ. Washington Acad. Sci., vol. 6, No. 17, 1916, p. 607 (listed); 

 Unstalked crinoids of the Siboga-Exped., 1918, p. 177 (in key; range), p. 179 (references). — 

 Gislen, Kungl. Fysiogr. Sallsk. Handl., new ser., vol. 45, No. 11, 1934, p. 22. 



Crossometra distincta Gislen, Ark. Zool., vol. 19, No. 32, Feb. 20, 1928, p. 8, No. 34 (notes). 



Diagnostic features. — The cirri have 17-26 (usually ahout 20) segments and are 

 20-30 (usually 20-25) mm. long; the earlier segments are markedly longer than broad 

 and the distal are broader than long; the cirrus sockets are arranged in 10 columns on 

 the centrodorsal ; the 14-33 (usually 20-25) arms are 100-205 mm. long; the IIBr series 

 are all or mostly 4(3 + 4); and the division series and arm bases are smooth. 



Description — As described by Carpenter the centrodorsal is a thick disk with the 

 interradial angles somewhat produced. The cirri, as determined by Gislen from an 

 examination of the type specimen in the British Museum, are arranged in 10 columns, 

 2 in each radial area. 



The cirri are about XXV, about 20. The sixth and seventh segments are the 

 longest, according to the figure from slightly longer than broad to half again as long 

 as broad. The segments following are shorter and gradually develop a dorsal keel, 

 and according to the figure a slight tubercle in the middle of the dorsal side of the 

 distal end. 



843803—50 17 



