34-0 SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOI,. 50 



Type. — Catalogue No. 22,660, U. S. N. M. ; from Albatross Sta- 

 tion No. 3717, Sagami Bay, Japan; 63-100 fathoms. 



The small number of arms, combined with the number of cirrus 

 segments and long second pinnule, readily distinguish this species 

 from all the other forms of Zygometra. 



ANTEDON ADRESTINE, sp. nov. 



Centro-dorsal more or less hemispherical, bearing about forty 

 cirri; these are 10 to 12 mm. long with twelve to fifteen segments, 

 all longer than broad, the proximal two-thirds very much so, and 

 constricted centrally with prominent distal edges ; no dorsal spines ;. 

 terminal claw very small. 



Radials just visible; first costals very short, deeply incised by the 

 rhombic axillaries, and with a transversely elongate tubercle on each 

 side ; axillaries rhombic, slightly wider than high, with a median keel 

 in the posterior half; ten arms 35 mm. long, with about ninety seg- 

 ments ; first brachial very short, incised by the much larger and 

 irregular second brachial ; third brachial squarish ; following bra- 

 chials to the eighth oblong or slightly quadrate, wider than long, 

 becoming longer than wide after the twelfth and more elongate dis- 

 tally; syzygia in the third, eighth, and twelfth brachials, and dis- 

 tally at intervals of two. The costals and first brachials are in 

 apposition laterally. 



Lower pinnules very long; first pinnule 10 mm. long with 19 long 

 segments; pinnule on the third brachial 10 mm. long with 18 elon- 

 gated segments ; second pinnule slightly longer, with eighteen seg- 

 ments ; pinnule on fifth brachial similar ; third pinnule 1 1 mm. long, 

 with twenty elongated segments; pinnule on seventh brachial about 

 7 mm. long, with about fifteen segments ; the eighth and following 

 pinnules bear genital glands ; distal pinnules moderately long, very 

 slender, the first segment short, the second and following very long. 



Color (in spirits) dirty white, a broad median band of brown on 

 each arm; cirri light brown, white at the articulations; or white, a 

 broad median band of purple on each arm ; cirri white. 



Type. — Catalogue No. 22,659, U. S. N. M. ; from Albatross 

 Station No. 3713, off the southern coast of Hondo, Japan; 45-48 

 fathoms. 



The great length of all the lower pinnules, combined with the few 

 cirrus segments, is sufficient to distinguish this species from all the 

 others of the genus Antedon. 



