144 BULLETIN 8 2, UNITED STATES NATIONAL MUSEUM 



is undoubtedly much too short, as in all other dimensions the type is larger than the 

 present specimen. 



In general appearance this species is intermediate between gigantea and annandalei, 

 though rather more like the former. It differs from gigantea in having keels on the 

 proximal elements of the pairs of ossicles forming the division series as well as on the 

 distal, and on the first brachials as well as on the second; in the more numerously seg- 

 mented, more slender, and relatively longer cirri; in having more numerous arms (28 

 instead of 17); in the absence of intcrradial ridges separating the columns of cirrus 

 sockets on the centrodorsal; in the much less spinous borders of the division series and 

 lower brachials; and in having the IIIBr series 4(3 + 4) instead of 2. It differs from 

 annandalei in being larger and more robust; in having no spines on the dorsal surface of 

 the proximal ossicles; in having the ossicles of the division series with irregularly dentate 

 produced lateral borders instead of smooth; in the much less spinous dorsal surface of 

 the earlier brachials; and in the larger and stouter cirri. 



Localities. — Siboga station 251 ; Arafura Sea, west of the Kei Islands (lat. 5°28'24" 

 S., long. 132°00'12" E.); 204 meters; hard coral sand; December 8, 1899 [A. H. Clark, 

 1912, 1916, 1918, 1932; Gislen, 1934] (1, Amsterdam Mus.). 



Danish Expedition to the Kei Islands; Dr. Th. Mortensen; station 12; 320 meters; 

 sand; April 9, 1922 (1, C. M.). 



Danish Expedition to the Kei Islands; Dr. Th. Mortensen; station 56; 345 meters; 

 mud; May 10, 1922 (1, C. M.). 



Danish Expedition to the Kei Islands; Dr. Th. Mortensen; station 58; 290 meters; 

 mud; May 12, 1922 (1, C. M.). 



South of western Timor (lat. 10°26'24" S., long. 123°46'18" E.); 256-292 meters; 

 cable repair ship The Cable, Eastern Australasia and China Telegraph Company, July 

 1, 1928 [A. II. Clark, 1932] (1, B. M.). 



Geographical range. — From the Kei Islands to Timor. 



Bathymetrical range. — From 204 to 345 meters. 



History. — This species was originally described in 1912 from a single specimen 

 from Siboga station 251 under the name of Thalassometra magna. In 1916 it was 

 listed as Oceanometra magna, and it was redescribed and figured under that name in 

 1918. In 1932 I recorded and gave notes on a second specimen that had been brought 

 up by the cable repair ship The Cable off Timor, and in 1934 Prof. Torsten Gislen 

 discussed the arm structure of this species. 



OCEANOMETRA ANNANDALEI (A. H. Clark) 



Plate 15, Figures 45, 46 

 [See also vol. 1, pt. 2, figs. 222, p. 173, 515, 516, p. 283.] 



Crotalometra eupedata (part) A. H. Clark, Proc. U. S. Nat. Mus., vol. 30, 1909, p. 406 (Albatross 

 station 51 Hi; characters). 



Crotalometra annandalei A. H. Clark, Proc. U. S. Nat. Mus., vol. 36, 1909, p. 642 (description; 

 Malay Archipelago, 30 fms.). 



Thalassometra annandalei A. H. Clark, Proc. U. S. Nat. Mus., vol. 39, 1911, p. 551 (referred to 

 Thalassometra; near gigantea; Albatross station 5116 [originally recorded as eupedata], 5280, 5503, 

 5504, 5506, 5536; abnormal specimens); Zool. Anz., vol. 39, No. 11/12, 1912, p. 425 (compared 

 with Th. [Oceanometra] magna); Crinoids of the Indian Ocean, 1912, p. 195 (synonymy; detailed 



