460 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



marked synarthrial tubercle on the articulation between the IBri and IBr 2 . The IIBr 

 series are 2 and resemble the IBr series ; they are in lateral contact with their neighbors. 

 Both elements of the IIBr series have the outer border swollen, and the axillary has 

 the inner angle also swollen. 



The 15 arms are about 90 mm. long. The first brachials are wedge-shaped, about 

 three times as long exteriorly as interiorly. The distal border is slightly incised, and 

 the inner border of adjacent first brachials are united in the proximal two-thirds, 

 diverging at approximately a right angle beyond this point. The second brachials 

 are somewhat larger than the first and are more obliquely wedge-shaped with the outer 

 side longer and the inner side of about the same length. The first syzygial pair 

 (composed of brachials 3+4) is almost oblong, but with the epizygal (fourth brachial) 

 slightly longer interiorly than exteriorly, about three times as broad as long. The 

 next five brachials are slightly wedge-shaped, about four tunes as broad as the median 

 length, those following soon becoming very obliquely wedge-shaped, almost triangular, 

 about twice as broad as long. After the proximal third of the arms the obliquity of 

 the ends of the brachials gradually diminishes so that in the outer half of the arms the 

 brachials are almost oblong, between three and four tunes as broad as long, becoming 

 longer terminally. 



P! is 10 mm. long, with 21 segments, slender, tapering somewhat more rapidly on 

 the first four segments than later. The third segment is about as long as broad, and 

 the eighth and following are about twice as long as broad. P 2 is 13 mm. long, with 19 

 segments, much stouter than P! and tapering evenly from the base to the tip, stiffened, 

 but becoming flexible at the tip; the third segment is slightly longer than broad, the 

 sixth is about twice as long as broad, and the twelfth and folio whig are about three 

 tunes as long as broad. P 3 is 15 mm. long, with 17 segments, resembling P 2 but 

 proportionately larger and stouter. P 4 is 10 mm. long, with 14 or 15 segments, and 

 resembles P 2 . PS is 5.5 mm. long, with 12 segments, which become about as long as 

 broad on the fifth and terminally nearly three times as long as broad; it is slightly 

 less broad basally than the preceding pinnules, tapers more rapidly, and is more 

 flexible distally. The pinnules following are of the same length as P 4 and are com- 

 posed of 14 or 15 segments, of which the third-sixth or -seventh bear on their lower 

 edge a prominent glassy keel, which disappears on the longer and more slender distal 

 pinnules. 



The disk is naked. 



Locality. Amboina Bay; about 91 meters; stones and sand; Danish Expedition 

 to the Kei Islands; Dr. Th. Mortensen, March 2, 1922 (1, C. M.). 



Remarks. This species as yet is known only from the type specimen. 



Genus LIPAROMETRA A. H. Clark 



Comatula (Alecto) (part) J. MULLER, Abh. preuss. Akad. Wiss., 1847 (1849), p. 263. 



Comatula (part) DUJARDIN and HUP, Histoire naturelle des zoophytes, fichinodermes, 1862, p. 207. 



Antedon (part) P. H. CARPENTER, Trans. Linn. Soc. (Zool.), ser. 2, vol. 2, 1879, pp. 29, 45, and follow- 

 ing authors. 



Himerometra (part) A. H. CLARK, Smithsonian Misc. Coll., vol. 50, 1907, p. 356. 



Dichrometra (part) A. H. CLARK, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 13. 



Liparometra A. H. CLARK, Proc. Biol. Soc. Washington, vol. 26, 1913, p. 142 (in key), p. 143 (diagno- 

 sis; genotype Himerometra grandis A. H. Clark, 1908; range; depth; included species); Unstalked 



