506 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



long as broad. The seventh or eighth (usually the latter) is a transition segment, 

 strongly marked, and bearing a conspicuous dark band. The outer segments are 

 nearly or quite twice as broad as long. The distal dorsal edge of the segments 

 following the transition segment slowly becomes more and more prominent, forming a 

 serrate transverse ridge which on the outer segments becomes subterminal, remaining 

 as a narrow serrate ridge which may be more or less elevated in the center. On 

 about the fifth segment following the transition segment a small low tubercle appears 

 midway between this ridge and the proximal end of the segments which on the outer 

 segments becomes pointed, so that in lateral view the dorsal profile of the segments is 

 bidentate, as in Oligometrides adeonae. The longer proximal segments are slightly 

 constricted centrally with prominent ends. Proximal to the transition segment the 

 cirri are brownish yellow; beyond, white with a highly polished surface. 



In the type specimen all the IIBr series are present, and all are 4 (3 + 4) . All of 

 the IIIBr series are present, and all are 2. There is no further division. The division 

 series are moderately broad and are well rounded dorsally and moderately separated. 

 The dorsal interradial perisome carries small scattered inconspicuous plates. 



There are in the type exactly 40 arms which are 95 mm. long. All of the arms 

 are grooved. The brachials are moderately overlapping. 



Syzygies occur between brachials 3 + 4, 11 + 12 (more rarely 12 + 13), 16 + 17 

 (less commonly 17 + 18), and distally at intervals of 3 muscular articulations. 



The mouth is submarginal and interradial. 



Remarks. Comantheria weberi is very closely related to C. intermedia of southern 

 Japan, from which it differs in having somewhat stouter cirri with fewer segments, 

 of which the longest are half again as long as broad instead of being only slightly 

 longer than broad. 



Locality. Siboga station 49a; Sapeh Strait, between Sumbava and Komodo, 

 Lesser Sunda Islands (lat. 8 23' 30" S., long. 119 04' 36" E.); 69 meters; coral 

 and shells; April 14, 1899 [A. H. Clark, 1912, 1918] (1, Amsterdam Mus.). PI. 58, 

 fig. 166. 



History. This species is as yet only known from the single specimen secured by 

 the Siboga. 



COMANTHERIA PERPLEXUM (H. L. Clark) 



Comanthus perplexum H. L. CLARK, Biol. Results Fishing Exper. F. I. S. Endeavour, 1909-1914, 

 vol. 4, pt. 1, June 2, 1916, p. 14 (description; off Ballina, N. S. W.; 27-28 fathoms); pi. 3, fig. 2. 



Diagnostic features. A rather small species with (in the type) 44 arms, the IIBr 

 series being 4 (3+4) and the IIIBr series 2. The cirri, which resemble those of 

 weberi, have 16-19 segments and are about 13 mm. long. 



Description. The centrodorsal is well developed, nearly 5 mm. in diameter, 

 with the dorsal pole slightly concave. The cirii are arranged in a single marginal row. 



There are about 15 cirrus sockets, 7 or 8 of which bear more or less developed cirri. 

 The largest of these are about 13 mm. long and consist of 16-19 segments, of which 

 the 3 or 4 preceding the penultimate carry very insignificant elevations or ridges on 

 the proximal dorsal margin. 



The radials are visible. The IBr[ are broadly triangular and are not in contact 

 interradially. The IIBr series are 4 (3 + 4), low, broad, smooth, and practically 



