150 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiii. 



Disk naked, deeply incised, the anal tube greatly elongated (9 mm, 

 in length), the anal interambulacrum being much larger than the 

 others, the mouth subcentral. 



First radials concealed; second radials short, in lateral contact for 

 the basal half; axillaries low-pentagonal, well separated laterall}^; 

 distichals and palmars 2, articulated (the latter developed on the 

 outer side of the rays only), resemljling the two outer radials, but 

 longer in proportion to the width. Twenty-eight arms 70 mm. long, 

 the first 10 brachials ol)long, then short-quadrate, becoming oblong 

 again distally; syz\'gies in the third (sometimes the second) l)ra 

 chials, again about the fourteenth to twentieth, and distally at inter- 

 vals of 3-5 joints. 



First pinnule short, 5 nun. in length, with 15 short joints; second 

 pinnule longer; third pinnule much the longest, 11 mm. long, with 

 about 20 elongated cylindrical joints; succeeding pinnules short, 

 becoming long and slender distall^^ 



Color in life light purplish gray, the skeleton yellowish white, with 

 a narrow purple median line. 



ri/j>e. C^t. No. 22646, U.S.N.M.; from Alhatnmx station No. 4930; 

 30^ 12' 00" north latitude, 130^^ 14' 00" east longitude (Eastern Sea); 

 84 fathoms; August 15, 1906. 



This species comes nearest to Antedon himdeulafa P. II. Carpenter, 

 from which it differs in its elongate cirri, with nearly double the 

 num])er of joints, the short inters3"gial interval and the more proxi- 

 mal position of the second syzygy, the proportions of the lower 

 pinnules, and the less number of arms. 



The color of A. himaculata is probably quite unreliable as a specific 

 character, for of the 80 specimens I have at hand of A. manca 

 one is colored exactly as described for A. Mmaculata^ although all the 

 others are quite different. A. delicatissvma in color agrees most 

 nearly with certain specimens of .4. multicolor. 



28. ANTEDON RUBROFLAVA, new species. 



Centro-dorsal discoidal, broad, slightly concave on the dorsal sur- 

 face, bearing 35-40 very stout cirri in two marginal rows; the cirri 

 have 15-20 joints, stout, about as wide as long, which exhibit a slight 

 tendency to overlap ventrally, but do not bear dorsal spines; the joints 

 are somewhat compressed and are constricted in the middle, thus 

 giving especial prominence to the articulations; the penultimate joint 

 is furnished with an opposing spine. 



First radials concealed; second radials partiallv concealed; axilla- 

 ries pentagonal, wider than high, with a syzygy; distichals 3, the 

 axillary a syzygy. P^leven arms 180 nun. long, with 260 or more 

 joints, the first 8 or 9 })rachials nearly oblong, becoming distally 

 triangular, all the brachials with overlapping edges, furnished with 



