684 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



The cirri are about XXX, 18 to 20, about 4 mm. long:. The second segment 

 is about as long as its median diameter; the third to fifth or si.xth are the longest, about 

 as long as the diameter of their expanded distal ends [presumably' about a third again 

 as long as their n)edian widths — A.M.C.] the following segments gradually decreasing in 

 length so that the outermost nine or ten are slightly broader than long. The longer ear- 

 lier segments are constricted centrallj', slightly carinate dorsally, with greatly expand- 

 ed and overlapping and very spinous distal ends, these features rapidly decreasing as 

 the segments become shorter. The short outer segments are subcarinate dorsally and 

 bear a slight dorsal spine. 



The radials are concealed by tlie centrodorsal. 



The IBri are extremely short, in close lateral apposition, ^vith the lateral edges 

 slightly everted. The IBr2 (axillaries) are nearly as broad as long, almost triangular, 

 the lateral edges just in apposition with the lateral angles of the adjacent a.xillarics, and 

 bearing a moderately developed rounded proximal process. There is a faint shallow 

 median groove on both ossicles and their edges are prominently everted and spinous. 



The doi-sal surface of the lower brachials is more or less thickly covered with very 

 fine spines which form prominent frills at the distal edges. 



The width of the first syzj-gy is 0.5 mm. 



Pj is excessively delicate; the segments after the third are greatly elongated with 

 expanded and finely spinous distal ends. 



Locality.- — -Siboga station 150; east of Halmahera (Gilolo), Molucca Islands (lat. 

 0°06' N., long. 129°07'12" E.); 1089 meters; yellow gray mud and sand; stones; evi- 

 dently very rough bottom; August 11, 1899 [A. H. Clark, 1912, 1918] (1, Amsterdam 

 Mus.). 



Remarks. — In 1957 the type specimen was found to be in very poor condition, the 

 centrodorsal, cirri, pinnules and arms beyond the first few brachials having been lost. 



TONHOMETRA MULTICIRRA A. H. Clark 



Tonromelra mnllicirra .K. H. Clark, Journ. Linn. Soc. (Zool.), vol. .36, No. 249, 1929, p. 635 (listed), 

 p. 662 (south of Lorabok; 700 fms.; description; comparisons), pi. 42, fig. 8, pi. 44, fig. 16; Ann. 

 Mag. Nat. Hist., ser. 10, vol. 10, No. 58, 1932, p. 378 (listed), p. 383 (south of Lombok; 600 

 fms.; description); Proc. Biol. Soc. Washington, vol. 47, 1934, p. 10. 



Diagnostic features. — Cirri XL-L, 25 to 33, the longest segments half again as long 

 as broad; P, with 13-16 segments, the joints markedly swollen and spiny. 



Description. — The centrodorsal is rounded conical and is almost completely covered 

 with cirrus sockets which decrease markedly in size from the periphery to the apex. 



The cirri are about XI.,, 25 to 28 and about 12 mm. long. The apical cirri are about 

 a fourth the length of the peripheral ones and with as few as 14 segments. In the long 

 peripheral cirri the second segment is half again as broad as long, the third is a third 

 again as long as broad and the fourth and fifth, which are the longest, are half again as 

 long as broad. The following segments decrease in length, becoming as long as broad 

 b}"- the ninth and very slightly broader than long in the outer third of the cirrus. The 

 second to fourth segments arc somewhat constricted centrally wnth flaring and slightly 

 overlapping ends. From about the eighth onwards, the segments have a rather broad 

 median carination in the middorsal line, the crest of which in profile is at firet evenly 

 convex, the ma.\-imum convexity being displaced toward the distal end on the outer 

 segments. The opposing spine is prominent, conical, arising from the entire dorsal sur- 

 face of tiie penultimate segment, with the apex median to subterminal. The terminal 



