144 PROCEEDINGS OP THE NATIONAL MUSEUM. vol. xxxiii. 



separated by a darker band. Some specimens, more often the larger 

 ones, are grayish, the distal portion of the arms bright j^ellow. 



Type.— C^it. No. 22627, U.S.N.M.; from Albatross station No. 4934; 

 30" 58' 30" north latitude, 130° 32' 00". east longitude (Eastern Sea); 

 152-103 fathoms; August 16, 1906. 



17. ANTEDON MINOR, new species. 



Centro-dorsal conical, rather long, with 30-40 cirri 15 mm. long 

 with 40-45 joints, the basal half of which are longer than wide, the 

 terminal third with a very slight dorsal spine. 



The pinnule ambulacra are not plated. 



Three radials visible; the first crescentic and furnished with several 

 large blunt teeth in the middle of the distal edge; the second wide, 

 low, irregularly oblong, furnished laterall}' with several large blunt 

 teeth, often interlocking with those on the neighboring brachials, and 

 a row of large blunt teeth on the distal edge; axillaries high, produced 

 anteriorly into a sharp angle. Ten arms 50 mm. long; first brachial 

 irregular in shape with a much longer outer than inner edge, and 

 incised by the backward projection of the second brachial, which is 

 irregularly quadrate; third to fifth brachials oblong; following 

 brachials quadrate, about as wide as high, becoming elongate later. 



First pinnule with 8 or 10 elongated joints, considerably longer and 

 stouter than its successors, which decrease in length to about the fifth, 

 then gradually increase distall}^, A\''here they are about 6 mm. long with 

 12 joints, the first 2 expanded and trapezoidal, the others elongated 

 and slender. 



Color in life light yellow. 



Type.— Cat. No. 22638 U.S.N.M.; from Albatross station. No. 4965; 

 33° 35' 20" north latitude, 135° 10' 50" east longitude (off southern 

 Japan); 191 fathoms; August 28, 1906. 



This species is nearest to Antedon pusUla Carpenter, but it differs 

 in the much more numerous cirri, which are longer and more slender 

 with a much greater number of joints, in the character of the centro- 

 dorsal, which is conical and usually rather long instead of low-hemi- 

 spherical, and in the aspect of the radials, which are markedly longer. 



18. ANTEDON DIADEMA, new species. 



Centro-dorsal long and columnar, the tip conical, bearing about 20 

 slender cirri in 10 rows of 2 each, those of one row alternating in posi- 

 tion with those of the adjacent rows; cirri 25 mm. long with 50-56 

 joints, the basal half elongate, the distal short with prominent dorsal 

 spines. 



Basals just visible as small interradial tubercles. 



Radials rather long, the first and second about the same size, the 

 axillary widely pentagonal, broader than high, the axillary and second 



