134 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



everted and coarsely dentate. The distal edges of the IBr 2 are everted and finely 

 spinous. 



The 10 arms are about 70 mm. long. The first brachials are slightly wedge- 

 shaped, about twice as broad as the exterior length, with the interior sides united for 

 about two-thirds of their length, the distal third diverging at approximately a right 

 angle. The distal edge bears a small spinous tubercle in the center. The second 

 brachials are slightly larger and more nearly oblong. The first syzygial pair (com- 

 posed of brachials 3+4) is slightly longer interiorly than exteriorly, and is about as 

 broad as the exterior length. The next four brachials are oblong, half again as broad 

 as long, those succeeding becoming very obliquely wedge-shaped, slightly longer than 

 broad, and somewhat longer in the terminal portion of the arms. The brachials have 

 strongly overlapping and spinous distal ends. 



Syzygies occur between brachials 3+4, again from between brachials 9 + 10 to 

 between brachials 14 + 15, and distally at intervals of 4-8 (usually 5) muscular 

 articulations. 



P a is absent. P! is 10 mm. long, stiff and spinelike, with 12 segments of which 

 the first two are not so long as broad, the third tapers distally and is twice as long as 

 the distal width, and those following are about four times as long as broad. The 

 distal edges of the segments from the third, and especially from the fourth, onward are 

 armed with a frill of long spines. P 2 is 12 mm. long and is similar to PI but propor- 

 tionately stouter; it is composed of 12 segments. P 3 , P 4 , and P 5 are similar to P 2 . P 6 

 may be 1 1 mm. long, or there may be no decrease in length in these pinnules. The 

 pinnules following are shorter, more slender, and less stiffened. The distal pinnules 

 have the distal edges of the segments, except the basal, armed with long and prominent 

 spines. 



Locality. Ughi (or Ugi), Solomon Islands, a small island just north of San Chris- 

 toval or Bauro, the most southeasterly of the group [A. H. Clark, 1910, 1912, 1918] 

 (1, Austr. Mus.). 



History. This species was originally described by me in 1910 from a single speci- 

 men that was included in the collections of the Australian Museum which had been 

 sent to me for study. It was described in greater detail in a paper on the crinoicls of 

 the Solomon Islands published in 1912. As yet this species is known only from the 

 type specimen in the Australian Musem at Sydney. 



Genus CYLLOMETRA A. H. Clark 



Anledon (part) P. H. CARPENTER, Proc. Roy. Soc., 1879, p. 384; Bull. Mus. Comp. Zool., vol. 9, No. 

 4, 1881, p. 155, and following authors. 



Cyllometra A. H. CLARK, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, pp. 347, 356 (diagnosis; geno- 

 type Antedon manca P. H. Carpenter, 1888); Bull. Mus. Coinp. Zool., vol. 51, No. 8, 1908, p. 248 

 (same); Proc. U. S. Nat. Mus., vol. 34, 1908, p. 211 (referred to the Himerometridae), p. 212 

 (occurs in Japan), pp. 309, 318; Proc. Biol. Soc. Washington, vol. 21, 1908, p. 134 (pinnulation) , 

 p. 135 (referred to the Himerometridae); vol. 22, 1909, p. 6 (restricted; list of included species); 

 Proc. U. S. Nat. Mus., vol. 36, 1909, p. 362 (deficient pinnulation as in Comatilia); Amer. Nat., 

 vol. 43, 1909, p. 580 (pinnulation); Vid. Medd. Naturh. Foren. K0benhavn, 1909, p. 174 (in- 

 cluded in the Colobometridae), p. 193 (probably occurs at Singapore, though not yet found 

 there); Mem. Australian Mus., vol. 4, pt. 15, 1911, p. 725 (absent from Australia), p. 730 (in 

 key); Smithsonian Misc. Coll., vol. 60, No. 10, 1912, p. 25 (relation to Petasometra) ; Crinoids of 

 the Indian Ocean, 1912, p. 9 (absent from Australia), p. 11 (occurs both east and west of Ceylon), 

 p. 12 (occurs in the Persian Gulf, but not in the Red Sea), p. 22 (distribution in detail), p. 57 (in 



