1/4 
lo or II (only exceptionally more than lo) arms; 
IIBr series, if present, 2 
i' large ; proximal portion of animal very broad and 
well rounded, the profile of the division series and 
arm bases strongly convex; ossicles of the division 
series and arm bases with the lateral borders strongly, 
the proximal and distal less strongly, everted, un- 
modified, finely tubercular, or crenulate, and with 
a narrow blunt median keel ; brachials usually each 
with a prominent, though low, small rounded median 
tubercle which beyond the middle of the arm gradu- 
ally becomes obsolete ; cirrus segments slightly 
constricted centrally, with prominent ends ; stout with 
10 (exceptionally 11) arms 160 mm. to iSo mm. 
long; cirri about XXX, 15 — 21 (usually 16 — 19) 
(Hawaiian Islands; 574 — 812 Metres) . 
i" small ; proximal portion of animal narrow, the profile 
of the division series and arm bases diverging, in 
appro.ximately a straight line, at a relatively small 
angle with the dorsoventral axis; dorsal surface of 
the division series and first four brachials rising 
evenly, and rather steeply into a low and very 
blunt median keel, which becomes obsolete in the 
outer half of the arms; cirrus segments with un- 
modified proximal and distal borders; slender, with 
11 arms 65 mm. long; cirri XY, 16, 20 mm. long 
(southwestern Japan; 171 Metres) 
Calyptometra 
Chlorometra 
Crossometra A. H. Clark. 
Key to the Species of the Genus Crossometra. 
Proximal portion of the animal appearing narrow, the profile of the division 
series in lateral view nearly straight, making an angle of about 45° with 
the dorsoventral axis, or an angle of about 90° with each other; 29 — 32 
arms 150 mm. long; cirri XXV — XL, 23 — 26, 30 mm. to 40 mm. long 
(Timor to the Malay Archipelago and the Philippine Islands; 
54 — 520 Metres) investigatoris 
Proximal portion of the animal very broad and well rounded 
b^ distal cirrus segments about as long as their distal diameter, with the 
mid-dorsal line .sharpened, but not produced; division series evenly 
rounded dorsally, with no trace of tubercles on the individual ossicles 
(Moluccas;3io Metres) helius 
