123 
5- Decametra informis (P. 11. Carpenter). 
P. H. C.VKriiNTER. •'Challenger" Reports. The Comatulae, i88S, p. 205, pi. 33, fig. ^[AHtcdon 
informis). 
1 have at hand a specimen of this species from the Gulf of Davao, Philippine Islands, 
dredged in 23 fathoms ("Albatross" Stat. 5249; Cat. N" 35282 U.S. Nat. Mus.). 
Colobometra A. H. Clark. 
Key to the Species of the Genus Colobometra. 
a^ Cirri very long with about 60 (53 — 65) segments of which the longest are 
one third again as long as broad ; P.^ slightly larger than P., ; following pin- 
nules to P,; or P^ similar, slightly decreasing in length (Moluccas and New 
Guinea to New South Wales and Lord Howe Island) . . . perspinosa ') 
a' Cirri shorter, with not more than 52 segments; P., not longer than P, 
b^ 44 — 52 cirrus segments, none of which are as long as broad; P., similar 
to P, and of the same length; P, similar, but shorter; P, not greatly 
stiffened, composed of segments which become twice as long as broad 
on the si.xth and following (Moluccas to Singapore) z<eprctu»i 
\y not more than 40 (29 — 40) cirrus segments, of which the longest are 
longer than broad 
c^ P, markedly longer and stouter than the succeeding pinnules; P^ 
similar to P„ but shorter and more slender; 29 — 40 (usually about 
35) cirrus segments of which the two or three before the penultimate 
bear single median dorsal spines (Ceylon and the Bay of 
Bengal to the Lesser Sunda Islands, Borneo and the 
Philippines) discolor 
c- Pj to P. or P. approximately equal in length and stoutness 
d^ Pj resembles P„ and is stiff and spine-like with 10 segments 
of which the fourth and following are about four times as long 
as broad ; only the antepenultimate cirrus segment bears a 
single median dorsal spine; P. to P. similar and of approxim- 
ately equal length (S o 1 o m o n I s 1 a n d s) diadcma 
d- Pj is much less stiff than P.„ and is composed of 21 segments 
none of which are more than very slightly longer than broad; 
the 18 — 22 segments before the penultimate bear single median 
dorsal spines; P., to P. approximately equal in length and 
similar, with a very slight development of spines on the distal 
borders of the component segments (Philippine Islands) suavis 
I) Synonyms AnUdon tiisi^nis Hell, and AiileJon liven! Bell, 1884 (nol AiileJoii lovciii Bell, 1882 = Antidon pumila Hell, 1884). 
