48 
or even the IIBr axillary, beyond which point the perisome is solidly plated; the centrodorsal 
is very small, concave dorsally, sunken within the radial circlet; on three of the rays the IIIBr 
series are 2—4 (3 + 4)— 4 (3 + 4)— 2; on one ray 2—4 (3 + 4)— 4 (3 + 4)— 4 (3 + 4); and 
on the fifth 2—2—4 (3 + 4)— 4 (S + 4)- 
The fine example from Stat. 303 is fully grown, but carries eight more or less rudi- 
mentary cirri. 
The larger individual from Binonofka has 70 arms 120 mm. long: the centrodorsal is 
very thin, discoidal, with the flat dorsal pole 3.5 mm. in diameter; the cirri are XIV, 14 — 15, 
10 mm. long; the colour is whitish, the division series heavily blotched with dark gray; the 
outer part of the arms is dark gray; the outer part of the pinnules is brown. 
The smaller specimen from Binongka has 62 arm 95 mm. long; it closely resembles 
the following; there is usually one more division series on the outer branch of the IIIBr series 
than elsewhere; the arms are less developed and more slender than in the preceding, and the 
rays and division series are less broad; ^le centrodorsal is thin-discoidal, with the dorsal pole 
3 mm. in diameter; the cirri are XI, with some additional rudimentary, 14 — 15, 10 mm. to 
12 mm. long. 
The example from Batavia Bay has about 70 arms 85 mm. long; the rays and division 
series are comparatively narrow and well separated dorsally; the interradial perisome is heavily 
plated; the cirri are XIV, with others more or less rudimentary, 14 — 16, 10 mm. to 12 mm. 
long; the colour is slaty gray.' 
Comanthus -A. H. Clark. 
Key to the Subgenera of the Genus Comanthus. 
a^ Cirri always present, numerous, evenly distributed about the periphery of the 
centrodorsal, usually stout, compressed distally, except in two species with more 
than 20 segments; IIBr series almost invariably 4 (3 + 4) Cenolia 
a- Cirri few, small, weak, with the distal segments only slightly shorter than the 
proximal and only slightly compressed, irregularly distributed about the periphery 
of the centrodorsal, or absent altogether; one or more of the IIBr series 2 
instead of 4 (3 -f 4) Vania 
Key to the Species of the Genus Comanthus. 
a^ Cirri present 
b' cirri entirely without dorsal processes, large, stout, well developed, numerous, 
composed of 20 — 30 segments (usually 25 — 30) of which the outer are 
usually only slightly shorter than the pro.ximal ; centrodorsal very large, 
hemispherical, with a deeply concave dorsal pole; 60 to 120 (usually more 
than 70) arms from 130 mm. to 160 mm. in length (Q ueensland a n d 
the Loyalty Islands to the Andaman Islands and Singapore, 
a n d n o r t h w a r d t o t h e P e 1 e w a n d M a r s h a 1 1 I s 1 a n d s) . . . . bennetti 
