A MONOGRAPH OF THE EXISTING CRINOIDS 21 



long. 12836'31"E.); 247 meters; rocky bottom; bottom temperature 11.3 C.; August 

 9, 1906 (1, U.S.N.M., 35614). 



Albatross station 4900; Eastern Sea, between 10 and 20 miles southwest of the 

 Goto Islands; Ose Saki Light bearing N. 10 E., 8 miles distant (lat. 3228'50" N., 

 long. 12834'40" E.); 254 meters; gray sand and broken shells; bottom temperature 

 11.6 C.; August 10, 1906 (1, U.S.N.M., 35613). 



Albatross station 4893; Eastern Sea, between 10 and 20 miles southwest of the 

 Goto Islands; Ose Saki Light bearing N. 29 E., 5.5 miles distant (lat. 3232'00" N., 

 long. 12832'50" E.); 174-194 meters; gray sand, broken shells, and pebbles; bottom 

 temperature 13.3 C.; August 9, 1906 (1, U.S.N.M., 35612). 



Dr. Th. Mortensen's Pacific Expedition station 9; off Kin Shiu, Japan (lat. 3215' 

 N., long. 12812' E.); 165 meters; hard bottom; May 15, 1914 [Gislen, 1922, 1924, 

 1927, 1934]. 



Dr. Th. Mortensen's Pacific Expedition station 7; off Kiu Shiu, Japan (lat. 3217' 

 N., long. 12811' E.); 201 meters; sand; May 14, 1914 [Gislen, 1922, 1924, 1927, 1934]. 



Eastern Asia; Captain Suensson, July 29, 1900 [A. H. Clark, 1909, 1913] (1, C.M.). 



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



Bathymetrical range. From 141 (?95) to 311 meters; the average of 11 records is 

 199 meters. 



Thermal range. From 11.3 to 15.9 C. 



History. During the cruise of the United States Fisheries steamer Albatross in 

 Japanese waters in 1906 I collected a number of specimens of this species at five different 

 stations in the Eastern Sea. These I identified with Carpenter's Antedon quinqueco- 

 stata, except for three small individuals from station 4934 which I described as a new 

 species under the name of Antedon diadema in 1907. In the same paper I inserted 

 Antedon quinquecostata in a key to the new species described for comparison with 

 A. diadema. The two species were said to be differentiated by the occurrence of 70-90 

 slender cirrus segments in quinquecostata, whereas diadema has only 50-55 stout cirrus 

 segments. Antedon quinquecostata was compared with A. (Parametra) orion, sp. nov., 

 and with A. (Cosmiometra) aster, sp. nov., with which species it has very little in 

 common. I placed Hartlaub's Antedon conifera in the synonymy of A. quinquecostata, 

 a proceeding that now appears wholly illogical. Later in 1907 I referred diadema and 

 quinquecostata to my new genus Thalassometra. 



In 1908 I recorded Thalassometra quinquecostata from three localities in Sagami 

 Bay where it had been dredged by Alan Owston in his yacht the Golden Hind. 

 When in Yokohama I had met Mr. Owston, and he had shown me his fine collection of 

 Japanese crinoids. Later this collection was purchased by Frank Springer and deposited 

 in the United States National Museum. 



In January 1909, I established the new genus Stenometra to which I referred 

 diadema and quinquecostata, the latter including Hie specimens from southern Japan. 

 The genotype was given as Antedon quinquecostata P. H. Carpenter, 1888, but my 

 idea of this species was based entirely upon Japanese specimens. 



Dr. Theodor Mortensen, of the Zoological Museum, Copenhagen, Denmark, 

 kindly sent me for study the entire comatulid collection of that Museum. In the 

 collection were three specimens of the species I had identified as Antedon quinqueco- 

 stata that had been collected off southwestern Japan by one of the Danish cable repair 



