smaller blunt proximal tubercle; the spines change bul little distally, their bases becoming 

 slightly shorter and their apices consequently sharper, and the hypothenuse straight; the opposing 

 spine is longer than the spines on the preceding segments and more slender, median or sul>- 

 median, nearly or quite erect, nearly or quite equal to the diameter of the penultimate segment 

 in height; the terminal claw is longer than the penultimate segment, very long and slender, 

 slightly and evenly curved; the longer earlier segments have slightly enlarged ends; this 

 less in the spiniferous distal segments, though it is traceable quite to the penultimate. 



The division series and arms resemble those of D. flagellata, but are much more slender 

 and delicate; the division series and first brachials may be well separated, or they may bc in 

 lateral contact; they are usually not quite in apposition, though they have straight Iateral edges 

 which are usually slightly swollen; the characteristic rugose appearance ut' D. flagellata, due 

 ti> the luw. though prominent synarthrial and articular tubercles is reflected in a delicate and 

 modified form. 



The arms are [6—23, 70 mm. to 80 mm. Ion-. 



1' is from '1.0 mm. to 6.5 mm. lon<_r with 15 — 18 segments of which the first is short, 

 tlu- second nearly as long as broad, the third about as long as broad, and the seventh or 

 eighth and following slightly longer than broad. P 3 is 7 mm. long with 22 segments of which 

 the first is short, the second about as long as broad, the third slightly longer than broad, the 

 seventh <>r eighth and following half again as long as broad, becoming twice as long as broad 

 terminallv. the pinnule is very slightly stouter basally than ]',, but tapers less rapidly and more 

 gradually, and is less flagellate distally. P a is 9 mm. long with 23 segments, resembling P a but 

 proportionatel) stouter. 1', is 8 mm. long with 20 segments, resembling P.,; the second-fourth 

 ents are sometimes very slightly enlarged. P. is 4.5 mm. long with 14 segments, of the 

 same rharacter as P, but proportionately smaller. P 6 is 4.2 mm. long with 13 segments, similar 

 to P.. 1' is 3.7 mm. Ion- with 12 segments, similar to P B . The following pinnules are of about 

 the same length and stoutness, becoming weaker and more delicate distally. The distal pinnules 

 are 6 mm. long, very slender. with 18 — 19 segments. 



In nearly every detail of its structure this species agrees with D. flagellata \ with the 

 specimen of the latter which served Mi i.i.ir as the type of his Alecto elongata the agreement 

 is especiall) . in the number of cirri, the number of cirrus segments, the number of the 



cirrus segment which bears the lust dorsal spine, the proportions of the lower pinnules, and 

 the number of their component segments. But the great slenderness of the cirri, which have 

 greatly elongated distal segments serve easily to distinguish it. 



2. Dichrometra flagellata (J. Muller). • 



J. MULLER. Archiv fïir Naturgesch., 1841, I. p. 14? Alecto flagellata); p. 146 [Alecto elongata). 

 Harti VUB. Nova Acta der Ksl. Leop.-Carol. deutschen Akad. ilor Naturforsch., vol. 58, 1891, 



\" 1. ]). 71. pi. 1. fig. 47 (Antedon elongatc . pi. |. fig. 45 (Antedon flagellata). 



\. II. Clark. Vidensk. Medd. fra den naturhist. Forening i Köbenhavn, 1909, p. 172. 



Notes from tin- Leyden Museum, vol. 33, 1911, p. [84. 



Crinoids <>f tin Indian Ocean, 1912, \>. 150. 



