102 Papers from the Department of Marine Biology. 
to almost uniformly dead black, with bewildering diversity. One form is so 
sharply set off from the others that it is entitled to designation by varietal 
name and may be called var. ranthum. In it the dorsal surface is deep canary- 
yellow, while the pinnules are bright red. Only three specimens were found, 
all near the edge of the reef. Except for color, the specimens are not peculiar. 
Unfortunately the colors are very fugitive in alcohol. 
10. Comanthus callipeplum sp. nov. (xadXiwerdAos = beautifully robed). 
Centrodorsal moderate, flat, 5 mm. in diameter. Cirri vi, 15, about 
7mm.long. In addition to these rudimentary cirri, the margin of the centro- 
dorsal has 10 large cirrus sockets. The small cirri taper to a slender tip. 
I Br and II Br series in close contact with the adjoining series of the same 
rank on either side, their dorsal surface smooth and nearly flat. Arms 78, 
about 90 mm. long and with approximately 100 brachials. IJ Br series 
usually 4 (3-+4), but occasionally only 2. III Br series generally 2, but in one 
arm 3 and in two arms 4(38+4). IV Br series 4 (3+4), except one arm which 
has 2. V Br series 4 (8+4). Syzygies between brachials 3 and 4, and 8 
and 9, and then at intervals of three or four brachials. Outer brachials 
more or less overlapping with finely serrate distal margins. Lower pinnules 
on brachials rather short with 14 to 16 segments; distal pinnules notably longer 
and more slender, but with the same number of segments. Oral pinnules 
with 35 to 40 joints, but only the terminal fifth make up the comb. General 
color, dorsally dark green, with joints and some small spots greenish-yellow; 
sides of arms, including pinnules (and distally much of their dorsal surface), 
yellowish-white; centro-dorsal, partly white; cirri, yellow; tips of pinnules, usu- 
ally rusty-red. Oral surface, very dark, but finely mottled with yellow-green. 
Colors little altered by preservation in alcohol. 
This superb comatulid was found among madrepore corals near the outer 
edge of the southwest reef-flat at Maér. Only a single specimen was seen. 
Although nearly related to C. briareus (Bell), it is distinguishable by the 
presence of cirri, the great breadth of the II Br series, the absence of interradial 
plating, the frequent syzygies, and the remarkable coloration. The specimen 
was kept alive in the laboratory for nearly 24 hours, while a colored figure 
was being made, but it died and broke to pieces before preservation and is 
now in an unfortunately fragmentary condition. 
11. Comanthus luteofuscum sp. nov. (luteofuscus = yellow-brown). 
Centro-dorsal small (2 mm. in diameter of bare surface), thick, flat, or a 
trifle concave. Cirri xviI—xx11, 13-17, rather short, about 10 mm. long. 
Except segments 4-7 (from the base), the cirrus-segments are short, wider 
than long; except 7 or 8 basal segments, each segment has a dorsal elevation 
of more or less prominence; this may be a tubercle, a spine, or a rough trans- 
verse ridge; it is often conspicuous. I Br series 3 (2+3); I Br, in close 
opposition with its adjoining fellows; I Bre notably wider than I Br; and in 
broad contact with its fellows; I Br; almost triangular, very low and broad, 
well separated from its fellow on either side. Arms 20 to 30, notably short, 
50 to 60 mm. long, usually approximately equal but sometimes distinctly longer 
on one side of the animal than on the other; each arm is made up of 80 to 100 
brachials, which, except at tip of arm, are low, more or less discoidal, and have 
everted and finely serrate distal margins, particularly near middle of the arm. 
II Br series generally 4 (8+4), but occasionally 2. II Br, in close contact 
with its fellow of the same ray. III Br series generally 4 (8+ 4), but some- 
times 2. III Br, in contact with its fellow of the same half-ray. First 
brachials in similar contact. Syzygies between brachials 3 and 4; and 10-11 
or 11-12; after that at intervals of 3 to 5 segments. Oral pinnules with 30 
