1_'S BULLETIN 82. DOTTED STATES NATIONAL Ml SKIM 



The specimen from Challenger Btation 174 was described by Carpenter as repre- 

 senting a new Bpeciea, which he called Antedon tvbercvlata. According to Carpenter 

 the centrodorsal is Baucer-shaped. The cirri are about XL, 20 25, rather stout 

 with tolerably uniform Begments, few of which are longer than broad; tliere is a small 

 opposing spine. The radials are concealed by the centrodorsal. The IBr, are short 

 and rather convex dorsallj and are not united laterally. The IBr.. (axillaries) are 

 more than twice as long as the IBr, and are broadly pentagonal. The articulation 

 between the IBr, and IBr.. is rather tubercular. The division series are well sepa- 

 rated, and the postradial scries may divide three times. The HBr and IllBr series 

 are '_' and bear synarthria] tubercles. IIIBr series are usually developed only on 

 the outer Bides of the postradial scries, so that each post radial series bears six arms 

 arranged in -.1,1, 2 order. The ventrolateral borders of all the ossicles of the division 

 scries hear small tubercles, which project somewhat toward the ventral side. The 

 31 arms are about 90 mm. long and consist of 120 or more braelrials, the first 8 or 10 

 of which are thick disks, those following being shortly triangular and later becoming 

 more discoidal again. The Brsl syzygy is between brachials 3+4, the second from 

 between brachials 8 + 9 to between brachials 22 + 23, generally about bracldals 

 13+14 or 15 + 16, and the distal intersyzygial interval is from G to 11, usually 8, 

 muscular articulations. 



The pinnules of the first pair (I\ and P„) are about 9 mm. long and consist of 

 some '-■"» longish segments. The pinnules of the second pair (P 2 and P b ) are much 

 Stouter and very still' and tapering, reaching 15 mm. in length; they are composed of 

 about 12 segments all of which, except for those at the two ends, are much longer 

 than broad. The pinnules of the third pair (P 3 and P c ) are of the same character 

 but are rather shorter than the pinnules of the second pair. The pinnules of the 

 fourth pair (P 4 and P d ) are much smaller and less stiff. The disk is lost, but was 

 probably about 12 mm. in diameter. Sacculi are abundant along the ambulacral 

 grooves of both arms and pinnules. The color in alcohol is purplish white with 

 occasional dark purple bands, the ventral perisome greenish gray. 



1 examined tins specimen at the British Museum in 1910. There are 30 arms. 

 J', is slender and flexible, becoming very slender and flagellate dis tally. P 2 is much 

 enlarged, still' and spinelike, nearly half again as long as P 3 , with 12 segments. P 3 

 resembles I'_. bul is shorter and slightly less stout. P 4 is very short and small but is 

 more or less stiffened. \\ resembles P 4 . 



( larpenter said that tubi rcvlaia, as well &sspicata (from the Bands Sea ; see beyond) 

 and indiea ip. 439), is distinguished by the characters of the pinnules of the second 

 pair which are considerably longer than the pinnules of the first pair, though corn- 

 el of a smaller number <.l segments, which, however, are of very large size, some 

 of them reaching 1..") mm. The segments decrease gradually in diameter from the 

 to the tip of the pinnule so as to give the latter a remarkably stiff and tapering 

 appearance, lie said that there is some indication of this in marginaia (p. 447), but 

 its large pinnules are less stiff with relatively shorter segments, which are more uni- 

 form in diameter so that the pinnules lack the tapering and styliform appearance 

 which i- bo n in spicata and tuberculoid. In marffinata also the cirri are both 



smaller and ha\e fewer segments than those of tuberculoid, while the IBr, and [Br s 

 (axillaries) are more nearly equal in length, and portions of the radials are visible. 



