748 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



Rossinante station 269; Japan Sea (lat. 42°26' N., long. 131°52' E.); 370-516 

 meters; Oct. 5, 1931 [A. H. Clark, 1937). 



Rossinante station 277; Japan Sea (lat. 42°22' N., long. 131°27' E.); 600-630 

 meters; Oct. 6, 1931; K. Derjugin [A. H. Clark, 1937]. 



Rossinante station 74 ; Japan Sea (lat. 48°15' N., long. 140°52' E.) ; 576-592 meters; 

 August 6, 1931 ; Iwanow [A. H. Clark, 1937]. 



Number 301; Japan Sea; 1500 meters; May 30, 1932; K. Derjugin [A. H. Clark, 

 1937]. 



Number 308; Japan Sea; 900 meters; June 12, 1932; K. Derjugin [A. H. Clark, 

 1937]. 



Station 405; Japan Sea; 420-1095 meters; July 13, 1932; N. Tarasov [A. H. Clark, 

 1937]. 



Off Siwutsch Bay, northeastern Korea (lat. 41°5S' N., long. 130°30' E.); 1133 

 meters; Captain Suensson [A. H. Clark, 1913] (1, CM.). 



Off Kj5ng-S6ng, Korea Gat. 41°30' N., long. 129°33' E.) ; 914-1462 meters; 

 Schonau, May 10, 1893 [A. H. Clark, 1909] (1, CM.). 



?VIadivostock [von Graff, 1884]. 



Off Siong-Tschin, Korea (lat. 40°23' N., long. 129°33' E.); 256 meters; Captain 

 Suensson, 1882 [A. H. Clark, 1909] (3, CM.). 



Off Cape Duroch, southeast of Gen-San, Korea (lat. 38°21' N., long. 128°33' E.); 

 146 meters; Schonau, April 10, 1897 [A. H. Clark, 1909] (1, CM.). 



Albatross station 4822; off Nanao, Japan; No Said bearing S. 8° W., 4.5 miles 

 distant Gat. 37°08'10" N., long. 137°08'00" E.); 237 meters; temperature 4.11° C; 

 green mud; July 21, 1906 (1, U.S.N.M., 36221). 



?Locality; purchased at Shanghai by M. E. Deschamps [A. H. Clark, 1909] (1, 

 U.S.N.M., 35907). 



[Dr. Mortensen's station 20; Sagami Sea, Okinose; 110 meters; hard bottom 

 [Gisl^n, 1927] (? this species)]. 



Geographical range. — Gulf of Tartary and the Sea of Japan, south to Cape Duroch, 

 Korea and Nanao on the west coast of Honshu, Japan (? from the Sagami Sea). 



Bathymetrical range. — From 146 (?110) to 1500 meters; the average of 22 records 

 is 642 meters. 



Thermal range. — From 0.39° to 4.11° C; the average of 8 records is 1.13° C. 



Occurrence. — This species, like the others in the genus, seems to be an inhabitant 

 of muddy bottoms. In 7 instances the bottom is recorded as green mud, in one as gray 

 mud, sand and gravel, and in one as black mud and fine black sand. 



Thaumatometra tenuis was taken by the Albatross at 9 stations, at 7 of which it was 

 associated with Ileliometra glacialis maxima. In life it is easily distinguished from the 

 young of Ileliometra by the duller and more brownish color, by the more delicate and 

 translucent cirri wliich are composed of elongate segments, and by the more rugged 

 appearance. 



The association of this species in the Gulf of Tartary and in the Sea of Japan with 

 Heliometra glacialis maxima is especially interesting in contrast with the association of 

 the very different Poliometra prolixa and Heliometra glacialis in the Arctic seas. 



On the western coast of North America the species of Florometra are associated 



