30 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



The cirri are XXVI, 34-38, from 16 to 18 mm. long. The first 12 segments 

 are from one-third to one-half again as broad as long, and those following are similar 

 or a little shorter. The segments in the distal half of the cirri have a low transverse 

 ridge which is indistinctly, or not at all, divided into two tubercles, and which projects 

 slightly in lateral view. The opposing spine reaches in height half the width of the 

 penultimate segment. The terminal claw is stout and blunt and is about as long as 

 the penultimate segment. 



The radials are four times as broad as long, and are most evident in the interradial 

 angles of the calyx; they are laterally united basally. The IBri are three times as 

 broad as long, and are free laterally. The IBr 2 (auxiliaries) are broadly pentagonal, 

 half again as broad as long. There is a distinct synarthrial tubercle on the articulation 

 between the elements of the IBr series. Each ossicle from the IBri to the first brachial 

 bears a ventrolateral extension which is largest on the IIBri where it occupies the 

 entire side of the ossicle and reaches one-fifth of its lateral height. The IIBr and 

 IIIBr series are 2, the latter developed only externally. The ossicles immediately fol- 

 lowing each axillary are interiorly united. 



The 26 arms are 90 mm. long. The brachials are rather smooth. There are 

 21 brachials to each 10 mm. of arm length, or 18 if the syzygial pairs are counted as 

 units. The longer side of the distal brachials is two-thirds of their width, and the 

 shorter side is half the width. 



Syzygies occur between brachials 3+4 and 12+13, and distally at intervals of 

 7-10 (usually 7) umscular articulations. 



Pi is about 5 mm. long and consists of 18 segments. P 2 is 9 mm. long with 15 or 

 16 segments, and is very much stiff er and twice as stout as the other pinnules, or even 

 stouter. The distal ends of the segments from the sixth onward are thickened and 

 bear a row of spines. P 3 is 4 mm. long with 12 segments. P 4 is similar to P 3 . P a is 

 always present, though often only from 2 to 3 mm. long. The distal pinnules are 

 7.5 mm. long with 17 or 18 segments of which the outer are from two to three times 

 as long as broad. 



The disk is incised, and is 8-11 mm. in diameter. The anal tube is short and 

 pointed, 2.5 mm. high. 



The color is white with small brown spots, the distal half of the pinnules quite 

 violet-brown, the arms lighter with brown spots. 



Gislen noted that this specimen only differed from the type specimen of bella in 

 having somewhat more numerous cirri, which usually bear dorsally transverse ridges 

 instead of a pair of tubercles, and in having the ossicles immediately following the 

 axillaries only united basally. 



In the type specimen of Cenometra bella var. magnified from Jaluit, Marshall 

 Islands, as described by Professor Gislen, the dorsal pole of the centrodorsal is flattened 

 and pitted; the cirri are arranged in two closely crowded rows. The cirri are XXVIII, 

 42-45, from 22 to 28 mm. long. The longest proximal segments are half again as 

 broad as long and the distal segments are twice as broad as long. A dorsal knob or 

 indistinct transverse ridge occurs from the seventh segment onward, on about the 

 fourteenth segment transforming into two very low knobs which fuse again into a low 

 transverse ridge on about the thirty-eighth segment. In lateral view the knobs form 

 a very low, blunt dorsal prominence. The opposing spine is broad and stout, its 



