/ J) 
may bear a low, blunt or sharp, carinate ridge which, however, 
is never elevated into an overlap[Mng spine or tubercle 
f' a low sharp median keel of uniform height on the ossicles 
of the division series and all, or nearly all, of the brachials; 
ossicles of the division series and earlier brachials with 
abrui)tl\- everted borders and more or less numerous small 
tubercles or capitate spines scattered over the dorsal surface; 
lO — 1 8 (usually lo — 12) arms 100 mm. to 140 mm. long; 
IIBr 2 -or 4(3 + 4); cirri XV— XX, 13—15 (Philippine 
Islands;92 — 761 Metres) 
f- dorsal surface of the ossicles of the division series and 
brachials evenly rounded, or with a blunt median carination, 
or a broad low median tubercle, never with a low sharp 
median keel ; proximal and distal borders of the ossicles of 
the division series and of the lower brachials never everted 
and standing up at right angles to the general surface of 
the segments; no definite isolated small tubercles or capitate 
spines on the dorsal surface of the ossicles of the division 
series or earlier brachials, which are dorsally evenly rounded, 
irregularly rugose, or bluntly carinate 
g^ centrodorsal more or less conical, with the cirrus sockets 
arranged in ten definite columns, two in each radial area 
h' 26 — 3 3 arms; IIBr series always 4(3 + 4) (Kei Islands 
to the Malay Archipelago, the Philippine Is- 
lands and southern Japan; 54 — 403 Metres) 
h- not more than 20 (usually 10 — 20) arms; IIBr series, 
when present, usually 4 (3 -f 4), sometimes 2 (Lac- 
cadive Islands to Timor and the Kei Is- 
lands, and northward to the Philippines 
and southern Japan; 73 — 1269 Metres) 
g- centrodorsal thick discoidal or more or less columnar, 
the cirrus sockets arranged in 1 5 crowded columns 
h^ 1 2 — 28 arms 
i' all division series 2; extremely brittle and easily 
broken at the synarthries; 15 — 19 arms; cirri 
XXX, 19 (Moluccas and Phili])i)ine Islands; 
118 — 243 Metres) 
i" IIBr series 4 (3 -f 4); tough, the arms, rarely broken 
at the base during capture; 14 — 28 arms; cirri 
XX— XXX, 15 — 24 (South Africa to the Phi- 
lippine Islands and Fiji; 360 — 1314 Metres) 
Glyptometra 
Crossometra 
Perissometra 
Monachometra 
Pachylometra 
