162 COLLECTIONS FROM MELANESIA. 



Syzygies 3 : 10 : 19, or 3 : 11 : 21, or 3 : 13 : 21, or 3: 14: 21, or 



3 : 15 : 22 ; then from 6-10 joints between each. 



First pinnules very short ; third and fourth the stoutest and 

 longest, quite stiff, with well-developed broad lower joints, each of 

 which has a marked protuberance on either side ; the succeeding 

 ones shorter, and then again longer. 



Arms about 85 millim. long, the longest cirri 21 millim. ; dia- 

 meter of disk 6 millim. 



Colour : pale flesh, occasionally with a dark band here and there, 

 especially at the syzygies ; sometimes there is a good deal of brown. 

 The cirri are typically banded purple and white. 



Prince of Wales Channel; Torres Straits. 



This species has some resemblance to A. decipiens ; but it may be 

 distinguished from it by (a) the absence of spines from the joints of 

 the cirri, (/3) the broader lower pinnules, and (y) the greater length 

 of the more distal pinnules. 



13. Antedon elegans. (Plate XIII. fig. B, «.) 



Centrodorsal small and flattened; cirri marginal, in two rows, 

 25-30, with 40 joints, the fifth to tenth rather longer than broad ; 

 the succeeding ones with a short conical spine, which diminishes in 

 the more distal ones, but enlarges again somewhat as a penultimate 

 spine. 



First radials just visible ; second wide, barely in contact ; the 

 third comparatively short. Thirty arms. The three distichals 

 pretty long ; the axillary a syzygy. If the arms divide again there 

 are generally two joints, when the axillary is not a syzygy ; but 

 there may be three joints, and then the axillary is a syzygy. 

 The earlier brachials have even sides ; they then become wedge- 

 shaped, but do not overlap. Still further out, they become shorter 

 and project a little at the sides ; towards the free end of the arm 

 the upper face of each joint is sharply convex. 



Syzygies 3 : 11 : 22 ; then 9-13 joints between each. 



The first two pinnules are stiff and long, longer and stouter than 

 the third and fourth ; none of the following are long, but the rather 

 more distal are the longer. 



The disk is deeply incised, and the margins of the rays provided 

 with a well-developed and characteristic calcareous plating. 



Arms delicate, 95 millim. long, cirri 30 millim. ; disk (owing to 

 the incisions) only 8 millim. in diameter. 



Arms pinkish flesh-colour above, much darker below ; the cirri 

 ringed purplish and white. In a younger specimen there are 

 purplish spots on the arms above. 



Port Xlolle. 



A disk from Thursday Island probably belongs to this species. 



