222 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



History. -The genus Chlorometra was established in 1909 with the genotype 

 Antedon garrettiana A. H. Clark, 1907, also including Carpenter's Antedon aculeata. 

 In 1916 Antedon aculeata was removed to the new genus Chondrometra. In 1922 Prof. 

 Torsten Gislen established the genus Diodontometra with the genotype D. bocki, which 

 proves to be a synonym of the very poorly and inadequately described Antedon 

 garrettiana. 



CHLOROMETRA GARRETTIANA (A. H. Clark) 



PLATE 20, FIGURE 64 

 [See also vol. 1, pt. 2, fig. 228, p. 184.] 



Antedon garreUia.no. A. H. CLARK, Proc. U. S. Nat. Mus., vol. 33, 1907, p. 142 (description; Albatross 

 station 4894). 



Charitometra garrettiana A. H. CLARK, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 361 (listed) ; 

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



Chloromelra garrettiana A. H. CLARK, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 22 (listed); 

 Crinoids of the Indian Ocean, 1912, p. 225 (synonymy; locality); Journ. Washington Acad. 

 Sci., vol. 5, No. 6, 1915, p. 215 (southern Japanese species; range and its significance); Un- 

 stalked crinoids of the Si&oja-Exped., 1918, p. 190 (references). 



Diodontometra bocki GISLEN, Nova Acta Reg. Soc. Sci. Upsaliensis, ser. 4, vol. 5, No. 6, 1922, p. 123 

 (description; Bock's station 56), figs. 79-83, p. 88, fig. 84, p. 112, pi. 2, fig. 10; Zool. Bidrag 

 Uppsala, vol. 9, 1924, pp. 41, 42, 44, 53, 80, figs. 81, p. 81 (syzygial face), 110, p. 93 (synarthrial 

 face), 177-179, p. 98 (pinnule articulations); Vid. Medd. Dansk Naturh. Foren., K0benhavn, 

 vol. 83, 1927, p. 2 (station 9; 162 meters), p. 38 (station 9; notes), p. 68 (listed), figs. 28-33, 

 p. 37; Kungl. Fysiogr. Sallsk. Handl., new ser., vol. 45, No. 11, 1934, p. 21. 



Description. The centrodorsal is conical, 3 mm. broad at the base and 2.8 mm. 

 high, with the dorsal pole papillose. The cirrus sockets are arranged in 10 closely 

 crowded columns, 2 in each radial area, the pairs of columns being separated inter- 

 radially by an irregular interradial ridge but crowded together radially so that here 

 the sockets alternate with each other. 



The cirri are XX, 17; only a single cirrus remains, and this is not fully developed. 

 It is 20 mm. long. The first two segments are very short, more than twice as broad 

 as long, the third is twice as broad as long, the fourth is slightly broader than long, 

 and the fifth is about one-third again as long as broad; the next three are slightly 

 longer, the length then very slowly decreasing so that the antepenultimate is about 

 one-third again as long as broad. The penultimate is slightly longer. There is a 

 slight taper in the distal third of the cirri and the last two segments are dorsally 

 roundedly subcarinate. The opposing spine is terminal, small with a rounded and 

 not glassy tip, and is directed obliquely forward. The terminal claw is nearly as long 

 as the penultimate segment, moderately stout and evenly tapering, gently curved, and 

 glassy only at the tip. 



The ends of the basal rays project strongly as large, rather narrow, more or less 

 rhombic tubercles in the interradial angles. They separate the proximal half of the 

 radials and extend downward between the sockets of the upper row, when the sockets 

 are small reaching down to those of the lower row. 



The radials are rather narrow bands of uniform width with the center raised into 

 a prominent broad rounded tubercle. The IBri are short, nearly oblong, about four 

 times as broad as long, about twice as long as the radials, with the central portion 

 rather abruptly raised into a rounded keel. The IBr 2 (axillaries) are about three times 



