614 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



According to him the centrodorsal is a thin circular disk bearing about XV cirri 

 which have some 15 tolerably uniform segments, of which the distal are laterally 

 compressed and carry a faint dorsal spine. 



The radials are just visible. The IBri are closely united laterally. The IBr 

 series are broad, and the succeeding IIBr series are in close lateral contact. The IIBr 

 series are 2. The IIIBr and IVBr series are 4 (3 + 4). The IIBr and IIIBr series and 

 the lower brachials have rather flattened sides. 



The 46 arms are probably 110 mm. long. They are composed of subtriangular 

 and somewhat overlapping brachials w hich become more discoidal toward the middle 

 of the arms and squarer toward the ends. There are 120 brachials in the anterior and 

 80 in the posterior arms. Several of the arms are ungrooved. 



Syzygies occur between brachials 3 + 4, 11 + 12, and 16 + 17, and distally at 

 intervals of 4 or 5 muscular articulations. 



The second segments after the IIBr and subsequent axillaries bear long and rather 

 stout pinnules, P D reaching nearly 25 mm. in length. The pinnule of the fourth 

 brachial (epizj^gal) is smaller than PI, but those following are stouter, with rather 

 large segments. The terminal comb is small and is much obscured by perisome. 



The disk is 21 mm. in diameter and is naked. The mouth is radial. 



Carpenter's figure shows a quite typical specimen of timorensis, with rather more 

 cirri than usual. It does not quite agree with the description, for of the 10 IIBr 

 series 4 are 4 (3 + 4) and only 6 are 2. Furthermore, one of the IIIBr series is 2. I 

 examined this specimen in London. 



Dr. H. L. Clark's Comanthus callipeplum was described in the following terms: 



The centrodorsal is moderate, flat, 5 mm. in diameter. 



The cirri are VIII, 15, about 7 mm. long. In addition to these rudimentary cirri, 

 the margin of the centrodorsal has 10 large cirrus sockets. The small cirri taper to 

 a slender tip. 



The IIBr series are usually 4 (3 + 4), but occasionally 2. The IIIBr series are 

 generally 2, but in 1 arm 3 and in 2 arms 4 (3+4). The IVBr series are 4 (3 + 4) 

 except for 1 which is 2. The IBr and IIBr series are in close contact with their neigh- 

 bors, and their dorsal surface is smooth and nearly flat. 



The 78 arms are about 90 mm. long, and consist of approximately 100 brachials. 

 The outer brachials are more or less overlapping, with finely serrate distal margins. 



Syzygies occur between brachials 3+4 and 8 + 9, and then at intervals of 4 or 5 

 muscular articulations. 



The pinnules on the division series have 35-40 segments, but only those in the 

 terminal fifth are involved in the comb. The lower brachial pinnules are rather short, 

 with 14-16 segments. The distal pinnules are notably longer and more slender, with 

 the same number of segments. 



Doctor Clark said that although this species is nearly related to Comantheria 

 briareus it is distinguishable by the presence of cirri, the great breadth of the IIBr 

 series, the absence of interradial plating, the frequent syzygies, and the remarkable 

 coloration. In 1918 I placed it in the synonymy of Comantheria briareus. But a sub- 

 sequent examination of the type showed that it is undoubtedly an example of 

 Comanthus timorensis. 



