102 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLDMB 1 



being longer than the dorsal. The cirri are compressed distally. The terminal claw is 

 short, curved and very sharp ; the opposing spine is small, but sharp and conspicuous. 



The radials are nearly or quite concealed by the centrodorsal. The IB^ are oblong, 

 about four times as wide as long, the lateral edges straight, parallel and a trifle everted. 

 The IBr 2 are low, twice as broad as long, pentagonal with the lateral margins about half 

 as long as those of the IBr!. The distal angle is a right angle. 



The 10 arms are about 40 mm. long. The first brachial is wedge shaped, twice as 

 long externally as internally, just in contact internally with its fellow of the adjacent 

 arm. The first syzygies are between brachials 3+4, 9 + 10, 14 + 15, and then at intervals 

 of three muscular articulations. 



P! is 5 to 7 mm. long. It is rather stiff and tapering, much stouter than the 

 succeeding pinnules, and has 10 to 12 segments, of which the second is longer than 

 broad, the following ones twice and distally three times as long as broad. The third 

 and following segments have the distal edge on the outer side rather prominent. P 2 is 

 3.5 mm. long, with 7 segments, slightly more elongate than those of P b with rather more 

 prominent ends. P 3 is slightly shorter than P 2 , somewhat more slender, less stiffened 

 and with a gonad. 



Localities. St. Vincent's Gulf, South Australia [H. L. Clark, 1928] (2, S. Austr. M.). 

 Type locality. 



Marino, South Australia; on reef [Cotton and Godfrey, 1942]. 



EUANTEDON MOLUCCANA (A. H. Clark, 



Antedon moluccana A. H. CLARK, Notes Leyden Mus., vol. 34, 1912, p. 129 (description; Siboga Sta. 



139). 

 Euantcdon moluccana A. H. CLARK, Smithsonian Misc. Coll., vol. 60, No. 10, 1912, p. 32 (comparison 



with E. sinensis); Unstalked crinoids of the Siboga-Exped., 1918, p. ix (relationships with E. 



tahitiensis and E. sinensis}, p. 200 (in key; range), p. 201 (references; detailed description; Sta. 



139), p. 273 (listed), pi. 25, figs. 72, 73. 



Diagnostic features.- There are 15 to 17 cirrus segments of which the longest are 

 about 4 times as long as the median diameter and the distal decrease in length so that 

 the antepenultimate is little, if at all, longer than broad; the cirrus segments have a 

 straight dorsal and ventral profile, and their ends are not enlarged. 



Description. Centrodorsal low hemispherical, the bare dorsal pole 1.5 mm. in 

 diameter and very slightly convex with an obscure broad median tubercle surrounded 

 by obsolete cirrus sockets. 



Cirri about XXX, 15-17 (usually 17), slender and delicate, the longest about 18 

 mm. long ; first segment very short, second from half again to twice as long as the median 

 diameter, third from two and a half to three times as long as the median diameter, 

 fourth and following about four times as long as the median diameter; segments after 

 the eighth slowly become shorter so that the antepenultimate is little, if at all, longer 

 than broad; penultimate segment small, wedge-shaped, about half the size of the 

 antepenultimate; opposing spine small and subterminal; longer earlier segments 

 moderately constricted centrally, with expanded and slightly overlapping ends; shorter 

 terminal segments with straighter dorsal and ventral profiles, so that in lateral view the 

 cirri appear to broaden just at the tip; there may be a slightly marked transition seg- 

 ment at about the eighth. 



Distal borders of the radials even with the rim of the centrodorsal. 



