204 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



column in the middle of each radial area, 3, in one case 4, to a column; the surface of 

 the centrodorsal between the columns is bare and flat. 



A very small specimen has the arms 75 mm. long; the centrodorsal, which exactly 

 resembles that in the preceding except that the interradial areas are slightly convex, 

 appears unnaturally large. The radials are as large as the IBr,; deep subradial clefts 

 are present. The longest cirrus is 18 mm. long with 17 segments; the short apical cirri 

 are 7 mm. long with 1 1 segments, of which the third corresponds to the fourth in the 

 larger cirri. The longer segments are proportionately slightly longer than in the larger 

 cirri, and there arc only four short distal segments instead of eight or nine. The divi- 

 sion series and arm bases are obscurely rounded carina te, resembling those of C. aculeate 

 as figured by Carpenter. 



Another very small specimen has the arms 55 mm. long, and the longest cirri 12 

 mm. long with 13 segments. 



All the specimens from this station have the median brachial ornamentation very 

 slightly less accentuated than in the type. As in the type, the centrodorsal is sharply 

 conical, and the cirrus sockets are arranged in two closely crowded converging columns 

 which are confined to the midradial region. 



Localities.— Albatross station 534S; Palawan Passage, Philippines; Point Tabonan 

 bearing S. 89° E., 33.5 miles distant (lat, 10°57'45" N., long. 118°38'15" E.); 685 

 meters; bottom temperature 13.55° C; coral and sand; December 27, 1908 [A. H. 

 Clark, 1911, 1912, 1916, 1918] (3, U.S.N.M., 27505 [type], 35660). 



Albatross station 5349; Palawan Passage; Point Tabonan bearing N. 85° E., 45.2 

 miles distant (lat. 10°54'00" N., long. 118°26'20" E.); 1,334 meters; bottom tempera- 

 ture 4.77° C; coral and sand; December 27, 1908 [A. H. Clark, 1911, 1912, 1916, 1918] 

 (1, U.S.N.M., 35661). 



Siboga station 297; East Timor Sea (lat. 10°39' S., long. 123°40' E.); 520 meters; 

 soft gray mud with brown upper layer; January 27, 1900 [A. H. Clark, 1918] (6, 

 U.S.N.M., E. 464; Amsterdam Mus.). 



Geographical range. — From the southern Philippines southward to the East Timor 

 Sea. 



Bathymetrical range. — From 520 to 1,334 meters. 



Thermal range.— From 4.77° to 13.55° C. 



History. — This species was originally described in 1911 under the name of Chloro- 

 metra robusta from a large specimen from Albatross station 5348; notes were given on 

 two others from the same station, and another large specimen from station 5349. 

 Chlorometra robusta was listed, with the synonymy and locality, in my memoir on the 

 crinoids of the Indian Ocean published in 1912. In 1916 Chlorometra robusta was 

 selected as the type species of the new genus Chondrometra. In my memoir on the 

 unstalked crinoids of the Siboga Expedition published in 1918 six specimens were re- 

 corded from station 297; notes on these were given, and the centrodorsal of one of 

 them was figured. 



CHONDROMETRA ACULEATA (P. H. Carpenter) 



Antedon aculeata P. H. Carpenter, Challenger Reports, Zoology, vol. 26, part 60, 1888, p. 128 (de- 

 scription; Challenger station 214), pi. 23, fig. 3. — Hartlatjb, Bull. Mus. Comp. Zool., vol. 27, 

 No. 4, 1895, p. 131 (systematic and bathymetrical relationships). — A. H. Clark, Proc. U. S. 

 Nat. Mus., vol. 33, 1907, p. 142 (compared with A. [Chlorometra] garrettinana) .— Hamann, 



