A MONOGRAPH OF THE EXISTING CRINOIDS H9 



The ossicles of the IBr series and lower brachials are almost smooth. The distal 

 angles of the IBri and the proximal angles of the IBr 2 (axillaries) , and the corresponding 

 angles of the first two brachials and of the elements of the first syzygial pair, are widely 

 cut away forming large and prominent water pores. The edges of the ossicles bordering 

 these water pores are more or less everted and coarsely denticulate, or bear a few 

 coarse spines. 



The 10 arms are about 115 mm. long. The dorsal surface of the brachials beyond 

 the first syzygial pair is roughened with numerous short crowded spines. 



Syzygies occur between brachials 3 + 4, again from between brachials 14 + 15 to 

 between brachials 16+17, and distally at intervals of from 4 to 8 muscular articulations. 



Notes. — In the specimen from Menado Bay, Celebes, one IIBr 2 series is present 

 so that there are 11 arms. 



Localities. — Siboga station 161; Halmahera Sea, west of Waigeu (lat. 1°10'30" S., 

 long. 130°09'00" E.); 798 meters; muddy sand; August 17, 1899 [A. H. Clark, 1912, 

 1918] (1, Amsterdam Mus.). 



Menado Bay, northern Celebes (lat. 1°31' N., long. 124° 47' E.); 457 meters; 

 Captain Christiansen, Great Northern Telegraph Company, March 12, 1913 (1, C. M.). 



Geographical range. — From the Halmahera Sea west of Waigeu northward to Me- 

 nado Bay, Celebes. 



Bathymetrical range. — From 457 to 798 meters. 



History. — This species was described in 1912 under the name of Crotalometra 

 sulcata. It was redescribed and figured as Aglaometra sulcata in 1918. 



Genus STIREMETRA A. H. Clark 



Antedon (part) P. H. Carpenter, Proc. Roy. Soc. Edinburgh, vol. 12, 1884, p. 368, and following 

 authors. 



Thalassometra (part) A. H. Clark, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 359. 



Sliremetra A. H. Clark, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 15 (diagnosis; genotype Antedon 

 acutiradia P. H. Carpenter, 1888); Mem. Australian Mus., vol. 4, 1911, pp. 730, 731 (in key), 

 p. 735 (one species in Australia), p. 789 (original reference; characters; range); Crinoids of the 

 Indian Ocean, 1912, p. 10 (absent from Japan), p. 11 (absent from the west coast of the Malay 

 Peninsula, the Andamans, and from farther west), p. 24 (range), p. 59 (in key), p. 210 (original 

 reference; type); Die Crinoiden der Antarktis, 1915, p. 125 (the component species show the 

 characteristic features of Anthometra adriani); Unstalked crinoids of the Sifcoj/o-Exped., 1918, 

 p. 146 (in key; range), p. 160 (key to the included species); The Danish Ingolf-'Exped., vol. 4, 

 No. 5, Crinoidea, 1923, p. 40 (range). — Gislen, Vid. Medd. Dansk naturh. Foren. K0benhavn, 

 vol. 83, 1927, p. 6. — Mortensen, Handbook of the echinoderms of the British Isles, 1927, p. 25 

 (occurrence in northeast Atlantic; In key). — Nobre, Echinodermes de Portugal, 1931, p. 163 

 (diagnosis). — Gislen, Kungl. Fy s ' g r - Sallsk. Handl., new ser., vol. 45, No. 11, 1934, p. 18. — 

 Nobre, Echinodermes de Portugal, 1938, p. 185 (in key), p. 186. 



Diagnosis. — A genus of Thalassometridae in which the arms are dorsally rounded 

 to the tips and are 10-14 (rarely more than 10) in number, with the IIBr series 2 or 

 4(3 + 4) ; the division series and arm bases are carinate or subcarinate, smooth dorsally 

 and with straight sides or sometimes everted edges; the cirri are recurved distally. the 

 short outer segments bearing prominent dorsal spines; there is no appreciable expansion 

 of the earlier segments of the genital pinnules; and the size is small, the arms being 

 45-80 mm. in length and the cirri 17-50 mm. long with 30-66 segments. 



