ANTEnON PINNIFORMIS. '181 



are longer than broad. Each one from the eighth onwards 

 bears a slight dorsal spine which becomes somewhat larg- 

 er on the penultimate joiut. The first radials are par- 

 tially visible; the second oblong and almost completely 

 united laterally. Axillaries widely pentagonal, nearly twice 

 the length of the second radials , with strong backward 

 projections into them , the surfaces of both joints rising 

 somewhat towards their junction. Ten arms. First bra- 

 chials bluntly wedgeshaped , and closely united laterally. 

 Each has its distal border incised to receive a strong back- 

 ward projection of the irregularly shaped second brachial. 

 Third brachial oblong, a syzygy. The next five joints are 

 wide and nearly oblong, with slight backward projections 

 from their proximal edges alternately on opposite sides of 

 the arm ; the following joints longer and wedgeshaped , be- 

 coming more oblong again in the outer parts of the arms. 



Syzygia very irregular after the first one on the third 

 brachial; the next may be anywhere between 14 and 

 21; then an interval of 5 — 18 joints between successive 

 syzygia. 



The stoutest pinnules are those borne by the fourth and 

 fifth brachials, which consist of about 12 thick joints slightly 

 longer than broad. Those on the second and third bra- 

 chials are less stout at the base but about as long as those 

 on the sixth and seventh joints, the immediate successors 

 of which are the shortest pinnules on the arm The fol- 

 lowing pinnules gradually increase in length , their compo- 

 nent joints becoming longer but more slender. The outer 

 pinnules are longer than the lower ones, and being very 

 closely set give the arms a very feathery appearance. 



Disc naked ; 5 mm. in diameter. Spread about 1 2 centim. 



Colour, white: the arms rather scantily clothed with a 

 browner perisome, so that the ambulacra are close down 

 on the muscles. 



Sacculi closely set along the pinnule ambulacra. 



Locality. Andai, New Guinea. 



>Jotes Iroin the Leyde» IMuseuni, Vol. HI. 



