184 
ninth and thirteenth (usually the eleventh) is oblong, and the following quickly become triangular, 
about as long as broad. 
The first four brachials have a low very broadly rounded median carination which is 
very obscure; the following have an equally obscure slight very broad convexity in the middle 
of the dorsal surface which after the eight or ninth becomes smaller in area and resolves itself 
into a low rounded tubercle witch gradually disappears after the end of the proximal third, 
though it may be detected as far as the end of the proximal half. 
The ornamentation of the smaller specimen is similar, but the tubercles on both elements 
of the IBr series are slightly narrower so as to appear as a broadly rounded carination. 
One of the specimens is six-rayed. 
Pachylometra .A. H. Clark. 
Key to the Species of the Genus Pachylometra. 
a* Cirri rather short and very stout, the segments very slightly, if at all, longer 
than broad, the outer more or less distinctly carinate, but without terminal 
tubercles; cirri XX — XXV, about 20 ; 20 arms 100 mm. long (Kermadec 
Islands to Fiji; 1134 — 2430 Metres) inaequalis 
a- Cirri longer and less stout, the longer proximal segments half again to twice 
as long as broad 
b' 20 — 28 arms 
c^ outer cirrus segments only slightly shorter than the more pro.ximal, at 
least one third again as long as broad, with no trace of dorsal tubercles; 
15 — 20 cirrus segments; 20 arms about 80 mm. long (off East London, 
South Africa; 450 — 540 ^Metres) sclateri 
c" outer cirrus segments much shorter than the longer proximal, at most 
only very slightly longer than broad and usually slightly broader than 
long, with prominent terminal tubercles on the mid-dorsal margin ; cirri 
XXVI — XXX, 19 — 24; 2 1 — 28 arms 100 mm. to 155 mm. long (Phi- 
lippine Islands; 360 — 761 Metres) _ . . distincia'^) 
\y 12 — 14 arms, 100 mm. long: cirri XXX — XXXV, 14 — 15, 15 mm. long 
(Philippine Islands; 889 — 13 16 Metres) Icvigata 
I. Pachylometra maeqiialis (P. H. Carpenter). 
P. H. Carpenter. "Challenger" Reports. Stalked Crinoids, 18S4, pi. 54, fig. 8 (Antedon 
inaequalis). 
"Challenger" Reports. Comatulae, 188S, p. 144, pi. 2, figs. 5^ — d; pi. 51, fig. 2; te.xt 
figure 5 A, p. 246 {Antedon inaequalis). 
A. H. Clark. Smithsonian Miscellaneous Collections, vol. 61, 191 3, N" 15, p. 48 [Pachylo- 
inetra inaequalis). 
i) Synonym: Charitonulra smithi \. H. Clark, igoS. 
