82 



BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



VOLUME 1 



Iridometra psyche A. H. CLARK, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 131 (listed); Proc. 

 U.S. Nat. Mus., vol. 34, 1908, p. 317 (Sagami Bay, 30 frns.); Crinoids of the Indian Ocean, 1912, 

 p. 231 (synonymy; southern Japan, 30 fms.); Journ. Washington Acad. Soi., vol. 5, No. 6, 1915, 

 p. 215 (southern Japanese species; range and its significance). TOBTONESE, Natura, Milano, 

 vol. 24, 1933, p. 166. 



Andrometra psyche A. H. CLARK, Journ. Washington Acad. Sci., vol. 7, No. 5, 1917, p. 128 (listed); 

 Unstalked crinoids of the Siboga-Exped., 1918, p. 210 (in key; range; references). 



Toxometra aequipinna GISL^N, Nova Acta Reg. Soc. Sci. Upsaliensis, ser. 4, vol. 5, No. 6, 1922, pp. 5, 

 129 (description; locality), p. 180 (listed); figs. 114-116, p. 122, pi. 2, fig. 11. 



a 



mm 



FIGURE 5. Andrometra psyche (A. H. Clark), U.S.N.M., 35694: a, Centrodorsal; b, proximal 

 part of postradial series; c, PI; d, P a ; e, PZ;/, cirrus of second row from periphery. 



Diagnostic features. The centrodorsal is low hemispherical to almost columnar; 

 P 2 has 10 to 13 segments and P 3 10 or 11; the brachials may have strongly everted and 

 spinous distal ends and the outer are more or less strongly constricted centrally. 



Description. The centrodorsal is low hemispherical to almost discoidal, with the 

 broad bare dorsal pole about 1 mm. in diameter. The cirrus sockets are arranged in 

 two or two and a partial third alternating rows. 



The cirri are XXVIII-XXXV, 10-18, from 5 to 7 mm. long. The first segment is 

 twice as broad as long, the second is about as long as broad, and the remainder are from 

 a third to half again as long as the median breadth, except for the penultimate, which 

 is as long as broad. The ends of the cirrus segments are somewhat enlarged. The 

 opposing spine is prominent, its height equaling about a third of the width of the penulti- 

 mate segment. The terminal claw, which is moderately curved, is slightly longer 

 than the penultimate segment. 



The radials may be just visible beyond the edge of the centrodorsal, or only evident 

 as low interradial triangles. The IBri are low and broad, about five times as broad as 

 long, more or less deeply incised by the posterior process from the axillary, with a more 

 or less prominent anterolateral tubercle and with a rounded median elevation which is 

 continued onto the proximal two-thirds of the axillary. The IBr 2 (axillaries) are a 



