A MONOGRAPH OP THE EXISTING CRINOIDS 279 



Reports, vol. 26, Zoology, 1888, p. 256 (specimen from Canton; the description and other 

 records refer to H. crenulala) .—Hartlaub, Nova Acta Acad. German., vol. 58, No. 1, 1891, p. 

 17 (characters; based chiefly upon A. crenulata). 



Antedon brockii Hartlaub, Nachr. Ges. Gottingen, May 1890, p. 183 (description; Amboina); 

 Nova Acta Acad. German., vol. 58, No. 1, 1891, p. 11 (collected by Brock at Amboina), p. IS 

 (in key), p. 23 (detailed description and comparisons), p. 113 (in Gottingen Mus.), pi. 1, figs. 4„ 

 12, 13, pi. 2, fig. 17. — Hamann, Bronns Klassen und Ordnungen des Tier-Reichs, vol. 2, Abt. 3, 

 1907, p. 1582 (listed).— A. H. Clark, Smithsonian Misc. Coll., vol. 60, No. 10, 1912, p. 16 

 (synonym of Antedon variipinna P. H. Carpenter, 1882); Crinoids of the Indian Ocean, 1912, 

 p. 36 ( = Heteromelra brockii); Unstalked crinoids of the Sibog&-Exped., 1918, p. 76, footnote 2 

 (= Heterometra variipinna). 



Himerometra brockii A. H. Clark, Smithsonian Misc. Coll., vol. 50, 1907, p. 356 (listed). 



Himerometra variipinna (part) A. H. Clark, Smithsonian Misc. Coll., vol. 50, 1907, p. 356 (listed). 



Amphimetra variipinna A. H. Clark, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 7 (listed [the 

 species contemplated is H. crenulala]) ; Smithsonian Misc. Coll., vol. 60, No. 10, 1912, p. 16 (type 

 specimen redescribed; includes Antedon brockii; not variipinna of authors, which is covered by 

 the name crenulata); Crinoids of the Indian Ocean, 1912, p. 110 (in part; record from Canton; 

 other records refer to H. crenulata); Die Fauna Sudwest-Australiens, vol. 4, Lief. 6, 1913, p. 314 

 (Australian records all refer to H. crenulata); Proc. Biol. Soc. Washington, vol. 26, 1913, p. 179 

 (range in east Asia). — Reichensperger, Abh. Senck. naturf. Ges., vol. 35, Heft 1, 1913, p. 92 

 (Am Islands; details of localities and notes). — A. H. Clark, Journ. Washington Acad. Sci., 

 vol. 5, 1915, p. 214 (Malayan species; range and its significance) ; Mortensen, Hong Kong 

 Nat., Suppl. No. 3, 1934, p. 5 (Canton). 



Heteromelra brockii A. H. Clark, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 11 (listed); Crinoids 

 of the Indian Ocean, 1912, p. 36 (identity), p. 127 (synonymy; Amboina). 



Heterometra variipinna A. H. Clark, Unstalked crinoids of the Siboga-Exped. 1918, p. 76 (in key; 

 range; synonymy). — Gislen, Kungl. Fysiogr. Sallsk. Lund Forh. vol. 7, No. 1, 1936, p. 10 

 (relation to H. crenulata) . 



Antedon brocki Gisl£n, Kungl. Svenska Vet.-Akad. Handl., vol. 59, No. 4, 1919, p. 23 (synonym of 

 variipinna) . 



Diagnostic features. — The enlarged lower pinnules are stout and are composed of 

 cylindrical segments of which the distal ends are everted and finely spinous ; in f un- 

 developed specimens P 2 is the longest pinnule and is composed of 22-35 segments. 



The cirri are 17-30 mm. long and composed of 28-38 segments of which a few 

 are about as long as broad or slightly longer than broad, and the outer are about 

 one-third again as broad as long; long and sharp dorsal spines are developed from 

 the ninth-twelfth onward. The 20-2S arms are 50-140 mm. long. The disk is more 

 or less extensively plated, especially on and about the anal tube. 



Description. — According to Carpenter the centrodorsal is a moderately thick 

 convex disk with the cirri in a double row. 



The cirri are about XXV, about 30. The segments are tolerably uniform, the 

 fifth being about as long as broad, the next two or three a trifle longer than broad, 

 and those following shorter again. From about the twelfth onward the segments 

 have rather sharp dorsal spines, that on the penultimate (the opposing spine) being 

 considerably larger than its predecessors. 



The radials are partially visible. The IBr, are oblong, short and broad, partially 

 united laterally. The IBr 2 (axillaries) are also short, but little longer than the IBr,, 

 and pentagonal with very open angles. The IIBr series are 4(3+4), the elements 

 having somewhat uneven edges. The IIIBr series are 2. 



There are 23 arms probably about 50 mm. long. The first segments after each 

 axillary are rhomboidal and are closely united laterally. The second brachials are 



