PART 5 A MONOGRAPH OF THE EXISTING CRIN'OIDS 151 



Dr. SLxten Bock's station 44;Bonin Islands; northwest of Ototojima; 128 meters; 

 July 31, 1914, [Gislen, 1922]. 



Dr. SLxten Bock's station 46; Bonin Islands; east of the Channel; 128 meters; 

 August 1, 1914 [Gislen, 1922]. 



Dr. Sixten Bock's station 47; Bonin Islands; east of the Channel; 146 meters; 

 August 1, 1914 [Gislen, 1922]. 



Dr. SLxten Bock's station 54; Bonin Islands; east of Chichijima; 128 meters; 

 broken shells and sand; August 7, 1914 [Gislen, 1922]. 



Dr. Sixten Bock's station 45; Bonin Islands; east of Chichijima; 146 meters; 

 July 31, 1914 [Gisl6n, 1922]. 



Suvadiva atoU, Maldive Islands; lagoon; 80 meters or less; Willehrord Snellius, 

 May 4, 1929 [A. H. Clark, 1936] (3, Leiden M.). 



Geographical range. — From Banda, Timor and Flores northward to the southern 

 Philippines and the Bonin Islands, and west to the Maldive Islands. 



Bathymetrical range. — -From the shore line down to 275, and possibly to 400, 

 meters. 



History. — This species was first described in 1912 from the collections of the Siboga, 

 which met with it at a number of different localities. It was subsequently found to 

 be rather common among the Bonin Islands by Dr. SLxten Bock, his specimens, col- 

 lected in 1914, having been recorded by Dr. T. Gislen in 1922. 



The known range was extended to the Maldive Islands by the collections of the 

 Snellius expedition, reported by the author in 1936. 



[Note by A.M.C] Following Gislen's synonjnuy of 1955, this species is now 

 referred to Antedon. 



ANTEDON IRIS (A. H. Clark) 



Figure 9,d 



Compsomeira loveni (not of Bell, 1882) A. H. Clark, Mem Australian Mus., vol. 4, 1911, p. 790 (part) 

 (Claremont I., 11 fms.). — H. L. Clark, Biol. Results Fishing Exper. F.I.S. Endeavour, 1909-14, 

 vol. 4, pt. 1, 1916, pp. 4, 26 (localities). 



Compsomeira iris A. H. Clark, Notes Leyden Mus., vol. 34, 1912, p. 131 (description; Siboga Sta. 

 144); Unstalked crinoids of the Siboga-Exped., 1918, p. x-iii (discovery by the Siboga), p. ix 

 (relationship with C. serrata), p. 205 (in key; range), p. 208 (references; detailed description; Sta. 

 144), p. 273 (listed), pi. 25, figs. 77, 78; Teraminckia, vol. 1, 1936, p. 295 (listed), p. 316 (locaUty). 



Diagnostic features. — The cirri are about XXX, short (about a fifth the arm length), 

 rather stout, and very strongly recurved in the outer three fourths, composed of 10 to 

 12 segments, of which the longest is about three times as long as the median width and 

 the distal become shorter, the antepenultimate being as long as, or very slightly longer 

 than, broad; P, has 16 to 18 segments and is about as long as the cirri; P2 is only half 

 as long as Pj; the eversion and production of the distal ends of the pinnule segments is 

 moderately developed; the centrodorsal is flattened hemispherical. 



The arms are 45 mm. and the cutI are 8 or 9 mm. in length in the type specimen. 



Description. — Centrodorsal very low hemispherical, the bare polar area almost 

 covered with pits representing obsolete cirrus sockets. 



Cirri XXX, 10-12, from 8 to 9 mm. long, the outer portion strongly recurved; 

 fii-st segment very short, second about twice as long as the median diameter, third 

 about three times as long as the median diameter, and fourth as long as the third; 



