342 SMITHSONIAN MISCELLANEOUS COLLECTIONS [vot. 50 



ten arms 45 mm. long; first five brachials roughly oblong, then 

 quadrate, longer than wide, becoming elongated distally; syzygia in 

 the third, eighth, and twelfth brachials, and distally at intervals of 

 three to five (usually four) segments. 



First pinnule the longest, about 4 mm. long, with ten segments, 

 the first short, the others much elongated; the following pinnules 

 become shorter, then increase again distally. 



Color (in spirits) dull yellow; probably yellow in life. 



Type. — Catalogue No. 22,663, U. S. N. M. ; from Albatross Sta- 

 tion No. 4933, off Kagoshima Gulf, Japan; 152 fathoms. 



This species comes nearest to Antedon pumila Bell, from which 

 it differs in the much greater number of cirrus segments (which are 

 much shorter distally), the much greater length of the cirri, and in 

 having the rays in close lateral apposition, not widely separated and 

 rounded, as in that species. The costals and lower brachials also 

 have more or less tubercular edges, while in A. pumila the edges are 

 smooth. Numerous specimens of the latter from Port Jackson were 

 used for comparison. 



