Si 
The arms vary t'roin ici to 13 (usually 11 — 13) in luunber, and are from 90 mm. to 
120 mm. long. 
P, is 7.5 mm. loiii^ with iS segments whicli, gradually increasing in length, become 
about as long as broad on the fourth or fifth and twice as long as broad terminally; the 
second-eighth have a strong, though rounded, supplementary ridge (this not being indicated in 
H. prodnctcx). P., is 10.5 mm. long with 17 segments, slightly stouter basally than P,, but 
tapering less gradually and composed of longer segments; the supplementary ridge occurs on 
the second-ninth. P., is similar to P.,, 9 mm. long. Pj is 6 mm. long with 1 i segments, a supple- 
mentary ridge on the second-fourth or -fifth. P, and P., are not stouter basally than the 
succeeding pinnules, but they taper with slightly less rapidity ; the distal angles of their component 
segments are only slightly swollen and produced — about as in II . prodiicta. The distal jjinnules 
are 10 mm. long, composed of 20 segments. 
The colour is brownish white, with occasional narrow bands of rusty on the arms; the 
cirri are white. 
This species is most closely related to H . prodiicta, but is even more slender and delicate. 
The elongate distal cirrus setjments serve to distinguish it at once. 
The characters of the si.x specimens from Stat. 318 are included in the above description. 
One of those from Stat. 320 has 11 arms 120 mm. long, with one IIBr 4(3 + 4) series; 
the cirri are 30 mm. long with 33 .segments. The other is smaller with 12 arms about 55 mm. 
long, both the IIBr .series being 2, and the cirri 20 mm. long. 
3. Heterometra quinduplicava (P. H. Carpenter). 
P. H. Carpenter. Quart. Journ. Geol. Soc, Feb. 1880, pp. 41 (footnote), 42, 43 (Antedon, 
sp., from Stat. 212). 
"Challenger" Reports. Comatulae, 1888, p. 229, pi. 39, fig. 5 [Antedon clemens); p. 254, 
pi. 35, figs. 1—3 {Antedon anceps); p. 262, pi. 4, figs, i a—d; pi. 47, figs. 4, 5 (Antedon 
quinduplicava). 
A. H. Clark. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, 190S, part 2, 
p. 214 {Himerometra quinduplicava). 
Proc. Biol. Soc. Washington, vol. 22, 1909, p. 7 [Amphimetra anceps); p. 11 [Hetero- 
metra quinduplicava). 
Vidensk. Medd. fra don naturhist. P'orening i Kobenhavn, 1909, p. 162 (Heterometra 
quinduplicava). 
Crinoids of the Indian Ocean, 19 12, p. 120 (Craspedometra anceps, except reference to 
C. aliena, which latter is H. crenulata); p. 130 (Heterometra quinduplicava). 
__ Smithsonian Miscellaneous Collections, vol. 61, 1913, N" 15, p. 23 [Amphimetra anceps); 
p. 27 [Heterometra quinduplicava). 
Stat. 99. Anchorage off North Ubian. 16—23 Metres, i Ex. 
The 26 arms are So mm. long; two of the arms arise directly from I Br axillaries; there 
are eight IIBr series of 4 (3 + 4) each of which bears internally a I IIBr series of 2. The cirri 
are XVIII, 27 — 30, 22 mm. long. 
This resembles exactly a specimen dredged by the "Albatross" at Stat. 5139, near J0I6 
(Sulu), in 20 fathoms (Cat. X" 35183 U. S. Xational Museum). 
SIBOG.'V-E.X.PEDITIE XLH 1*. '' 
