201 



When viewed at right angles to the plane of their dorsal surface the IBr 1 appear 

 oblong, about four times as broad as long; when viewed at right angles to the dorsoventral 

 axis of the animal the me.dian length appears to be about one third less than the lateral. 



The IBr (axillaries) are rhombic, half again as broad as long, the anterior angle sharp, 

 the posterior process very broad and obtuse ; the anterior borders are moderately concave ; 

 the proximal are straight e'xcept just before they reach the lateral border where they turn to 

 a hprizontal direction and then curve slightly dornward, fitting snugly around the rounded 

 distal angles of the IBr r 



The elements of the IBr series and the first two brachials are in very close lateral 

 apposition and are more or less sharply flattened against their neighbors. 



The arms are ioo mm. long. The first brachials are wedge-shaped, three times as long 

 exteriorly as interiorly, the inner borders in close contact. The second brachials are of nearly 

 the same size and shape, slightly larger ancl more irregular. The first syzygial pair (composed 

 of the third and fourth brachials) is slightly longer interiorly than exteriorly, twice as broad 

 as long. The following brachials as far as the second syzygy are irregularly wedge-shaped, 

 about three times as broad as long, those beyond the second syzygy triangular, somewhat 

 broader than long, soon becoming wedge-shaped, slightly broader than long, and distally 

 wedge-shaped, about as long as broad, and terminally longer than broad. 



Syzygies occur betvveen the third and fourth, ninth and tenth and fourteenth and fifteenth 

 brachials, and distally at intervals of three oblique muscular articulations. 



Pj 7.5 mm. long, composed of 10 -f- segments of which the first is twice as broad as 

 long, the second is slightly longer than broad, the third is half again as long as broad, and 

 the following are twice as long as broad, becoming three times as long as broad distally; the 

 third and following have rather prominent distal eads which are armed with fine spines, at 

 first only on the distal border (away from the ventral surface), later all around. The pinnule 

 is markedly stouter than those succeeding, and somewhat stiffened. 



P a is 6 mm. long with io segments, resembling F l but more slender with proportionately 

 longer segments distally. 



P 3 is 4.5 mm. long with 1 1 segments, smaller, more delicate, and less stiffened than P 2 . 



The distal pinnules are from 8 mm. to 9 mm. long, very delicate, composed of 20 — 21 



segments. 



This species is described from two specimens from Tahiti, Society Islands, in the 

 Zoölogical Museum (Staatssammlung) at Munich. 



2. Euantcdon moluccana (A. H. Clark). 



A. H. CLARK. Notes from the Leyden Museum, vol. 34, 19 12, p. 129 {Antedon moluccana). 



Stat. 139. o°ii'S., i27°25'E. Molucca Passage. 397 Metres. 1 Ex. 



The centrodqrsal is low hemispherical, the bare dorsal pole 1.5 mm. in diameter, very 



slightly convex, with an obscure broad median tubercle surrounded by obsolete cirrus sockets. 



The cirri are about XXX, 15 — 17 (usually 17), slender and delicate, the longest about 



SIBOGA-EXrELllTIE xi.ii/-. 26 



