450 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



PI is 9 mm. long, slender and flagellate, with 25 segments, of which the first three 

 are about as long as broad and those succeeding gradually become elongated, about 

 twice as long as broad or even a little longer in the outer third of the pinnule, then 

 short again terminally. P 2 is 15 mm. long, much stouter than PI, stiff, composed of 

 15 segments of which the first three are about as long as broad and those following 

 rapidly become elongated reaching a maximum length, on the eleventh or twelfth, 

 of somewhat over three times the width. P 3 and the following pinnules are much 

 shorter than P,, being only 5 mm. long, and are composed of 12-15 segments; later 

 the pinnules become gradually longer and more slender, the distal pinnules being 9 

 mm. long. The ossicles immediately following each axillary are interiorly united 

 basally, but are free distally. The division series and the brachials are widely free 

 laterally. In one arm of the type specimen the first four brachials are united into 

 two syzygial pairs. The color in alcohol is grayish brown. 



Hartlaub recorded a fine specimen from Ebon, Marshall Islands, which he said 

 had been collected by the Rev. B. G. Luon in 1877. It was part of the lot that 

 included the specimen just described and was collected by the Rev. B. G. Snow. 

 Hartlaub said that it is somewhat larger than his type specimens from Mortlock 

 Island and Torres Strait [the last represents indica], but otherwise it agrees completely 

 with them except in its color and in the number of its arms. There are 29 arms. 

 Four of the postradial series bear each 2 IIIBr series, which are externally developed. 

 P 3 is very small, not half so long as the spiniform P 2 . The skeleton is a uniform light 

 brownish white. Individual arms have light-brown cross stripes. The disk is light 

 gray, and in some places light brown. The borders of the ambulacral grooves are 

 dark slate gray. 



One of the specimens from Fiji was described by me as a new species, Himerometra 

 acuta, in the following terms: The centrodorsal is discoidal or low hemispherical. 

 The cirri are about XXXV, 20, 20 mm. long. About half of the segments are rather 

 longer than broad and the remainder are about as long as broad. The terminal seg- 

 ments are rather compressed laterally and have a faint dorsal keel that passes into the 

 opposing spine. The radials are just visible in the interradial angles of the calyx. 

 The IBr! are short, oblong, free laterally, and furnished with a rounded lateral pro- 

 jection. The IBr 2 (axillaries) are low pentagonal, nearly twice as broad as long. 

 The IIBr series are 2. The articulations between the elements of the division series 

 and the lower brachials are more or less tubercular. The elements of the division 

 series have rounded lateral projections. The 20 arms are 85-90 mm. long. The first 

 six brachials are oblong, and those following are obliquely wedge-shaped, almost 

 triangular, about half as long as broad, becoming less obliquely wedge-shaped and 

 finally oblong distally. P! is 4.5 mm. long, slender, weak, and tapering, with 12-13 

 segments of which the first three are short and those following become progressively 

 longer. P 2 is 10 mm. long, much stouter than P u stiff and styliform, with 15 segments, 

 of which the first two are broader than long and the remainder are elongated. The 

 succeeding pinnules are shorter than P!, and are composed of about 8 segments; 

 later the pinnules gradually increase in length distally. The color in formalin is 

 yellow-brown, the skeleton dull yellow. 



In the specimen from the Tonga Islands the cirri are XXIII, 16-20 (usually 19), 

 from 10 to 15 mm. long. There are 28 arms about 60 mm. long. The IIIBr series 





