152 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiii. 



the first joint is enormoush'' expanded laterals, the second intermedi- 

 ate between it and the other joints; second pinnule greatly elongated, 

 stiff, and spinelike, with 15 elongated joints; third pinnule usually 

 shorter, but similar in character; following pinnules decrease in length, 

 becoming somewhat longer distally. Pinnule ambulacra plated. 



Color (in spirits) light purple, banded with dull yellow; cirri 

 purple, banded with white. 



Tijpe.—OAt. No. 22654, U.S.N.M. ; from Alhatross station, No. 3744; 

 Suno Saki bearing east, 8.83 miles distant (off Nipon, Japan); 46 

 fathoms; May 19, 1900. 



This species belongs to the Accela group, but is readily distinguished 

 from the other 10-armed species by having the second radials sepa- 

 rated by a forward projection from the first radials, as in A. multicolor^ 

 combined with the lack of any lateral processes on the radials. 



30. ANTEDON HAWAIIENSIS, new species. 



Centro-dorsal large, hemispherical or short columnar, with 5 Avell- 

 separated doul)le rows of cirri, usually about 20 cirri in all; these are 

 32 mm. long, rather slender, with 50 to 55 short joints, the fourth to 

 the eighth rather longer than wide, the others wider than long; from 

 the tenth onward dorsal spines are developed which are long and 

 prominent. 



Basals sometimes just visible; first radials just visible, crescentic; 

 second radials very short; axillaries about one and one-half times as 

 wide as long. The radials and first (sometimes, also, the second) 

 brachials (or first and second distichals, when present) fringed with 

 numerous rather long, stout spines; there maj' be also a few scattered 

 spines on their dorsal surface. Distichals, when present, 4 (3+4). 

 Ten to 12 arms 110 nun. long, the first 6 brachials oblong, wider than 

 long, then triangular, about as long as wide; distally the arms are 

 compressed, and the brachials develop long, curved, overlapping spines, 

 as in A. spinifera. A S3"zygy in the third (or, after a distichal series, 

 the first) brachial, another at about the twentieth, and distally at 

 intervals of from two to four joints. 



First pinnule the longest, very stout, flattened exteriorly, with 

 about 12 joints, tapering rapidly after the seventh or eighth; second 

 and following pinnules much more slender, shorter, with fewer joints 

 but slightly longer than wide; the distal pinnules are somewhat elon- 

 gated, with elongate joints, except the first two, which are short, 

 somewhat expanded, and trapezoidal. 



Color (in spirits) white, the radials, distichals, and lower brachials 

 dusky. 



%>e.— Cat. No. 22653, U.S.N.M. ; from Alhatross station. No. 3475; 

 21° 08' 00" north latitude, 157° 43' 00" west longitude (Hawaiian 

 Islands); 351 fathoms; December 6, 1891. 



