148 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



Distal borders of the radials even with the run of the centrodorsal; their distal 

 angles are slightly separated. 



IBri about three times as broad as the lateral length, which is twice the median 

 length; lateral edges converge slightly, and widely separated from those of adjacent 

 IBr,; lateral portion of the proximal and distal edges sometimes slightly thickened; 

 IBr 2 (axillaries) rhombic, with the lateral angles truncated, twice as broad as long, 

 widely separated from their neighbors. 



Arms 10, from 15 to 20 mm. long, and slender; brachials with somewhat prom- 

 inent very finely spinous distal ends. 



Syzygies occur between brachials 3+4, 9 + 10, 14+15 and distally at intervals of 

 3 muscular articulations. 



PI from 2.3 to 3.5 mm. long with 9 or 10 segments, of which the first is twice as 

 broad as long, the second somewhat longer than broad, the third two and a half times 

 as long as the proximal diameter, and the following three times as long as the proximal 

 diameter; the third and following have prominently expanded and overlapping distal 

 ends which are especially prominent on the distal side of the pinnule, where they are 

 armed with long and prominent spines; P 2 about half as long as P b composed of 7 seg- 

 ments which are very long, with very strongly everted spinous distal ends, especially 

 on the distal side; a large gonad extends from the base of the third to the base of the 

 sixth segment; similar gonads occur on the following pinnules to and including P 6 . 



[NOTE BY A.M.C.] The paratype from Banda (Siboga station 240), with arms 

 about 35 mm. long, has the width at the first syzygy 0.6 mm. and the length from 

 the proximal edge of the IBrt to the second syzygy about 4 mm. 



Notes. Dr. Gisleu gives the following details for the specimens from the Bonin 

 Islands. 



No. 1 (station 46): The centrodorsal is about 1.4 mm. in diameter. The cirri are 

 about XXXV, 9-10, from 2.0 to 2.5 mm. long, arranged in two closely crowded 

 rows ; the third to fifth segments are very strongly constricted centrally, from two and 

 a half to three times as long as the distal diameter; the seventh segment is half again as 

 long as broad ; the outer segments are less constricted centrally. The IBr 2 (axillary) is 

 twice as broad as long, rhombic, the proximal angle incising the IB^ ; it is broader 

 than the IBr^ The arms are 20+ mm. in length, but not very much longer; the first 

 brachials are well separated interiorly. PI is 4 mm. long with 10 segments of which 

 the sixth and following have everted and spinous distal ends. P 2 is 2 mm. long, with 

 7 segments and without a genital gland, P 3 is 2.0 mm. long, with 7 segments, of 

 which the third to fifth carry a genital gland. P 8 is 4 mm. long, with 13 segments, of 

 which the first two are short and the remainder elongated. The disk is 4 mm. in diam- 

 eter; the anal tube is long. 



No. 2 (station 47): The cirri are XXXVII, 8-11, from 2.0 to 4.5 mm. long; the 

 fourth segment is the longest, from three to four times as long as broad. The radials 

 are concealed. The IBr 2 are half again as broad as long with strongly concave distal 

 borders. The first brachials are twice as long exteriorly as interiorly, twice as broad as 

 the external length, and basally in contact interiorly. The arms are 25 mm, long. 

 P] is 2 mm. long with 7 or 8 segments which, with the exception of the two first and the 

 terminal, are from two to three times as long as broad. P 2 is 1.2 mm. long, with 6 

 segments. P 3 is 2.2 mm. long, with 8 segments and carries a genital gland. P 4 is 2.2 

 mm. long, with 8 segments. The distal pinnules are 4 mm. long, with 14 segments. 



