558 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



4.2 mm. long, with 13 segments, similar to P 6 . P 7 is 3.7 mm. long, with 12 segments, 

 similar to P 8 . The following pinnules are of about the same length and stoutness, 

 becoming weaker and more delicate distally. The distal pinnules are 6 mm. long, 

 very slender, with 18 or 19 segments. 



Notes. -The preceding description is based upon specimens from Siboga station 

 320, the type locality. 



The largest of the five specimens from north of central Java has 26 arms. 



Remarks. In nearly every detail of its structure this species agrees with D. 

 flagellata. With the type specimen of Muller's Alecto elongata the agreement is espe- 

 cially close, in the number of cirri, the number of cirrus segments, the number of the 

 cirrus segment that bears the first dorsal spine, the proportions of the lower pinnules, 

 and the number of the component segments of the proximal pinnules. But the slender- 

 ness of the cirri, which have much elongated distal segments, serves easily to distin- 

 guish it. 



Localities. Siboga station 318; between Borneo and eastern Java (lat. 636'30" S., 

 long. 11455'30" E.); 88 meters; fine yellowish gray mud; February 22, 1900 [A. H. 

 Clark, 1918] (1, U.S.N.M., E. 408). 



Siboga station 320; between Borneo and eastern Java (lat. 605'00" S., long. 

 11407'00" E.) ; 82 meters; February 23, 1900 [A. H. Clark, 1912, 1918] (25, U.S.N.M., 

 E. 465; Amsterdam Mus.). 



Java Sea, north of central Java (lat. 541' S., long. 10921' E.); November 21, 

 1907 [A. H. Clark, 1933] (5). 



Java Sea, northnortheast of Indromayu Point, Java (lat. 455' S., long. 10856' 

 E.); October 23, 1907 [A. H. Clark, 1933] (2). 



Geographical range. Java Sea, from between southeastern Borneo and eastern 

 Java to north of western Java. 



Bathymetrical range. From the shoreline down to 88 meters. 



History. I originally described this species in 1912 from specimens dredged by 

 the Siboga at station 320. In my report on the unstalked crinoids of the Siboga 

 Expedition published in 1918 I recorded it also from station 318. 



Additional specimens from two localities were found in the collection of the 

 Zoological Museum at Buitenzorg, Java, which were recorded by me in 1933. 



DICHROMETRA AFRA A. H. Clark 



PLATE 58, FIGURES 269, 270 



Antedon flagellata LUDWIG, Abh. Senck. naturf. Ges., vol. 21, Heft 4, 1899, p. 538 (reef before the 

 harbor of Lamu; Zanzibar; 3 specimens from each locality). A. H. CLARK, Proc. U. S. Nat. 

 Mus., vol. 40, 1911, p. 4 (recorded by Ludwig from Zanzibar). 



Dichrometra sp. A. H. CLARK, Proc. U. S. Nat. Mus., vol. 40, 1911, p. 27 (Cape St. Andre", Madagas- 

 car, about 30 m.; Zanzibar; description; relationships); Bull. Mus. Hist. Nat., Paris, 1911, p. 

 254 (Cape St. Andre 1 , Madagascar, about 30 m.; description; affinities); Crinoids of the Indian 

 Ocean, 1912, p. 152 (same); John Murray Exped. 1933-34, Sci. Reports, vol. 4, No. 4, 1936 

 (Jan. 1, 1937), p. 100 (identity). 



Dichrometra flagellata var. afra A. H. CLARK, Smithsonian Misc. Coll., vol. 60, No. 10, 1912, p. 23 

 (Madagascar; description; includes A. flagellata Ludwig, 1899, and Dichrometra, spp. A. H. Clark), 

 p. 24 (comparison with D. flagellala) ; John Murray Exped. 1933-34, Sci. Reports, vol. 4, No. 4, 

 1936, p. 100 (range). GISLN, Kungl. Svenska Vet. Akad. Handl., ser. 3, vol. 17, No. 2, 1938, 

 p. 4. 



