A MONOGRAPH OF THE EXISTING CRINOIDS 265 



30" E.); 420 meters; temperature 27.78 C.; coarse sand and broken shells; February 

 22, 1908 [A. H. Clark, 1918] (1, U.S.N.M., 36003). 



Siboga station 95; north of the Tawi Tawi group, Sulu Archipelago (lat. 5 43' 

 30" N., long. 119 40' 00" E.); 522 meters; stony bottom; June 26, 1899 [A. H. 

 Clark, 1918] (1, Amsterdam Mus.). 



Siboga station 105; Sulu Archipelago (lat. 6 08' 00" N., long. 121 19' 00" E.); 

 275 meters; coral bottom; July 4, 1899 [A. H. Clark, 1918] (5, U.S.N.M., E. 410; 

 Amsterdam Mus.). 



Siboga; East Indies [A. H. Clark, 1912, 1918] (1, Amsterdam Mus.). PI. 28, 

 fig. 77. 



Dr. SLxten Bock's station 37; off Okinose, Sagami Bay, Japan; 731 meters; 

 JulyS, 1914 [Gisle"n, 1922]. 



Dr. Sixten Bock's station 36; Sagami Bay, Japan, directly off shore from Misaki; 

 366 meters; July 1, 1914 [Gisle"n, 1922]. 



Dr. Sixten Bock's station 4; the Metacrinus shoal off Misaki, Japan; 274 meters; 

 May 5, 1914 [GisleX 1922]. 



Erroneous locality. Dr. SLxten Bock's station 8; Korean Straits, off the Goto 

 Islands; 210 meters; temperature 13.7 C.; May 14, 1914 [Gisle"n, 1922, 1927]. GislSn 

 redetermined the specimen from this station as C. spinosissima. 



Geographical range. From the Lesser Sunda Islands and the Moluccas north- 

 ward to southern Japan. 



Bathymetrical range. From 73 to 731 meters; the average of 9 records is 358 

 meters. 



Thermal range. Two records, 27.78 C. and 28.34 C. 



Remarks. This species is closely related to C. hispida, but it is a smaller, more 

 delicate, and more slender form. The cirri, while resembling in structure those of 

 C. hispida, are usually arranged in 2 rows instead of in a single row on the centro- 

 dorsal, and are more slender and more numerous. 



From C. chadwicki, which also possesses the same type of centrodorsal and of 

 cirrus structure, it differs in having fewer cirrus segments and a smaller centrodorsal, 

 on which the cirri are arranged in two rows instead of in a single irregular row. 



History. This species was originally described in 1912 from specimens secured 

 by the Siboga. A more detailed account, with a figure, was published in 1918, when 

 it was recorded from 4 Siboga and 2 Albatross stations. 



Dr. Torsten Gisl6n recognized it among the specimens collected by Dr. Sixten 

 Bock off southern and southwestern Japan in 1914 and published an account of these 

 in 1922. In 1924 he published some additional notes on the arm structure. 



COMISSIA GRACILJPES A. H. Clark 



Plate 28, Figures 75, 76 



Comissia gracilipes A. H. CLARK, Proc. Biol. Soc. Washington, vol. 25, 1912, p. 19 (description; 

 Siboga station 267); Unstalked Crinoids of the Siboga Exped., 1918, p. 20 (in key; range); p. 22 

 (detailed description; stations 266, 267); p. 275 (listed); pi. 13, figs. 10, 11. GISLN, Nova 

 Acta reg. Soc. sci. Upsaliensis, ser. 4, vol. 5, No. 6, 1922, p. 4 (728 m.); p. 5 (Sagami Bay); 

 p. 7 (previous records); p. 24 (Bock's station 35; description); figs. 15-17, p. 28. 



