666 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



pinnule segments have smooth distal edges; there is no marsupium on the genital 

 pinnules. 



Type species. Antedon clio A. H. Clark, 1907. 



Geographical range. Southwestern Japan. 



Bathymetrical range. Known only from 195 meters. 



BOLEOMETRA CLIO (A. H. Clark) 



FIGURE 38 

 Antedon clio A. H. CLARK, Proe. U.S. Nat. Mus., vol. 33, 1907, p. 79 (description; Albatross sta. 



4904); Proc. Biol. Soc. Washington, vol. 24, 1911, p. 88 (referred to the genus Cyclometra) . 

 Heliometra clio A. H. CLARK, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 351 (listed); Proc. 



U.S. Nat. Mus., vol. 34, 1908, p. 318 (Japan). 

 Cyclometra clio A. H. CLARK, Proc. Biol. Soc. Washington, vol. 24, 1911, p. 88 (listed; synonymy, 



habitat and depth given); Crinoids of the Indian Ocean, 1912, p. 239 (synonymy; range); Journ. 



Washington Acad. Sci., vol. 5, 1915, No. 6, p. 215 (southern Japanese species; range and its 



significance) ; Die Crinoiden der Antarktis, 1915, p. 126 (range) ; Unstalked crinoids of the Siboga 



Exped., 1918, p. 244 (in key; range, references). GISLIJN, Vid. Medd. Nat. Foren. K0benhavn, 



vol. 83, 1927, pp. 50, 51 (comparison with Florometra mariae). 

 Boleometra clio A. H. CLARK, Proc. U.S. Nat. Mus., vol. 83, 1936, p. 248 (type species of new genus) ; 



John Murray Exped. 1933-34, Sci. Reports, vol. 4, No. 4, 1937, p. 105. 



Description [modified by A.M.C.]. The centrodorsal is rounded conical with a 

 large bare polar area, 1.9 mm. in vertical height, viewed radially, and about 2.8 mm. 

 in basal diameter. The crowded cirrus sockets tend to be arranged in vertical columns. 



The cirri are XL-L, 25-30, up to 17 mm. long. The fourth to fifteenth segments 

 are much longer than broad, the longest just over twice as long as their median widths, 

 and the following ones are shorter, becoming about as long as broad. The distal seg- 

 ments do not bear dorsal spines. 



The radials are visible in the interradial angles; then* distal angles are slightly 

 separated. The IBr! are very short, widely separated laterally, standing out at right 

 angles to the dorsoventral axis to meet the large proximal angle of the rhombic axillaries. 

 The latter are slightly longer than broad, with the distal angle somewhat open. 



The 10 arms are 55 mm. long. The first brachial is very short and like the IBri 

 is erected to meet the proximal angle of the succeeding ossicle; it has the interior edges 

 much shorter than the exterior. The second brachial is irregularly quadrate, produced 

 distally on the outer side of the arm and proximally in the median line. The first 

 syzygial pair is more than twice as long interiorly as exteriorly, the epizygal being 

 quadrate with the inner side longer than the outer and the hypozygal triangular with 

 the short side on the inner side of the arm and the apex on the outer side. The next 

 five brachials are irregularly oblong, the following five or six wedge-shaped and the 

 succeeding ones triangular, about as long as broad, becoming wedge-shaped again 

 distally. 



Syzygies occur between brachials 3+4, 9 + 10, and 14+15, and distally at intervals 

 of 3 to 5, usually 4, muscular articulations. The width at the first syzygy is 1.4 mm. 

 and the length from the proximal edge of the IBrj to the second syzygy is 8.0 mm. 



The lower brachials are raised distally, giving the profile of the lower part of 

 the arm a distinctly serrate appearance; the edges of the outer brachials are slightly 

 roughened but do not overlap. 



PI is 9 to 10 mm. long, very slender, composed of about 30 to 32 segments; the 

 basal 5 to 7 of these are short and wide, the following becoming more elongated and 



