140 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiii. 



times as wide as high, and bluntly carinate; axillaries low and wide, 

 about three times as wide as high, with a blunt median keel; the 

 radials and first 4 or 5 brachials have wall-like sides. Ten arms, 45 

 mm. long, the tirst brachials oblong with a blunt median keel, becom- 

 ing quadrate after the hftli, and more elongate toward the end of the 

 arms; a syzygy in the third brachial, another about the tenth, and 

 distall}' at intervals of 3 or 4 joints. 



First pinnule 2.5 mm. long, with 10 to 13 short joints, the first 4 or 5 

 consideral)ly wider than the others; the pinnule on the third brachial 

 is similar, but slightly shorter, with the basal joints not so much 

 enlarged; the second pinnule (fourth brachial) is 2 mm. long, with 6 

 joints, of which the third and fourth are laterally greatl}' expanded; 

 the next 5 pinnules are similar, with 6 or 7 joints, and usualh" the 

 third and fourth, sometimes the third, fourth, and fifth, greatly 

 expanded laterally; distally the pinnules l)ecome uniformly tapering 

 and slender, reaching 3.5 mm. in length, with about a dozen joints 

 but little longer than wide. 



Color in life, bright 3'ellow. 



Type.— Cat. No. 22635, U.S.N.M.; from Alhafross station No. 4890; 

 32" 2C' 30" north latitude, 128^ 36' 30" east longitude (Eastern Sea); 

 135 fathoms; August 9, 1906. 



This species is related to Antedon incisa Carpenter, but differs 

 markedly in the character of the pinnules and cirri, and in the 

 arrangement of the latter on the centro-dorsal. 



13. ANTEDON LATA, new species. 



Centro-dorsal a thick disk, bearing about 20 rol)ust cirri in two 

 marginal rows; the cirri are 21 mm. long and have 15 short and stout 

 joints, of which the sixth and seventh are the longest, and are slightly 

 longer than wide; the distal joints do not bear spines, but oxerlap 

 somewhat dorsally. 



First radials concealed; second radials and axillaries short and wide, 

 the edges crenulate, a large blunt tubercle occupying the center of 

 each, with several other smaller bhuit tubercles about the edges; the 

 radials and first 5 or 6 brachials are wall-sided and in close apposition. 

 Ten arms, 115 mm, in length, the first two brachials very irreg'ularly 

 oblong with large median tubercles and crenulated edges; the third 

 brachial is more regularly ol)long, the hypozygal with a row of 4 or 5 

 small blunt tubercles; the following 7 brachials are irregularly quad- 

 rate, their surfaces uneven, but not tubercular; after the tenth the 

 brachials become triangular, slightly wider than high, the edges over- 

 lapping somewhat, this condition l)ecoming more prominent distally, 

 where the joints become again quadrate; S3^zygies in the third bra- 

 chials, again about the twelfth, and distall}^ at intervals of 7 to 10 

 joints. 



