A MONOGRAPH OF THE EXISTING CRINOIDS 455 



Albatross station 4895; Eastern Sea, from 10 to 20 miles southwest of the Goto 

 Islands; Ose Saki light bearing N. 42 E., 4.7 miles distant Gat. 32 33' 10" N., long. 

 128 32' 10" E.); 174 meters; green sand, broken shells, and pebbles; August 9, 

 1906 [A. H. Clark, 1907] (1, U.S.N.M., 22657). PI. 52, fig. 154. 



Golden Hind; Sagami Bay, Japan (lat. 35 02' N., long. 138 50' E.); 100 meters; 

 Alan Owston coll., 7036 [A. H. Clark, 1908, 1911] (1, U.S.N.M., 35039). 



Golden Hind; Sagami Bay (lat. 35 06' N., long. 139 42' E.); 55 meters; April 

 24, 1902; or Sagami Bay Gat. 34 59' N., long. 139 33' E.); 110 meters; April 20, 

 1902; Alan Owston coll., 7214 [A. H. Clark, 1908, 1911] (1, U.S.N.M., 34966). 



Dr. Sixten Bock's expedition to Japan station 45; Bonin Islands, east of Chichi- 

 jima; 146 meters; July 31, 1914 [GisleX 1922]. 



Dr. Sixten Bock's expedition to Japan station 55; Bonin Islands, eastnortheast 

 of Chichijima; 210 meters; shells and sand; August 15, 1914 [Gisl6n, 1922]. 



Dr. Sixten Bock's expedition to Japan station 59; Bonin Islands, eastnortheast 

 of Anojima; 183 meters; August 15, 1914 [Gisldn, 1922]. 



Geographical range. Southern Japan from the Korean Straits to Sagami Bay, and 

 the Bonin Islands. 



Bathymetrical range. From 100 to 174 (?210) meters; the average of the 3 depths 

 accurately determined (174, 110, and 100 meters) is 128 meters. The depths given 

 for Dr. Sixten Bock's stations represent the length of line out, not the actual depth. 



Thermal range. One record, 13.28 C. 



History. This species was originally described in 1907 as Comatula serrata from 

 a specimen from the Korean Straits which had been dredged by the Albatross in 

 1906. 



In the collection of Mr. Alan Owston of Yokohama, which was purchased and 

 deposited in the United States National Museum by Mr. Frank Springer in 1907, 

 there were 2 specimens which I recorded in 1908 under the name of Comaster par- 

 vicirra. I soon found that these in reality represented C. serrata, and in 1911 pub- 

 lished a note to that effect. 



In 1922 Dr. Torsten Gisl6n recorded 3 specimens from each of 3 of Dr. Sixten 

 Bock's stations in the Bonin Islands. 



COMASTER TENELLA. sp. nov. 



Plate 51, Figures 150, 151 



Comanthus (Comanthus) rotalaria A. H. CLARK, Vidensk. Medd. fra den naturhist. Forening i 

 K0benhavn, 1909, p. 146 (Singapore, April 16, 1907, part). 



Diagnostic features. There are only 20 arms, which are about 65 mm. long, 

 and the cirri, which are segregated in pairs or threes in the interradial angles, are 

 XII, 10-11, and are rather weak and slender. 



This species is more easily confused with Comanthus parvicirra than with any 

 other species of Comaster. 



Description. The centrodorsal is very thin, discoidal, flat, 2 mm. in diameter. 

 The cirrus sockets are segregated in the interradial angles, there being 2 or 3 in each 

 angle. 



