167 
distal borders with very prominent short blunt thorns, but without 
spines on the dorsal surface; cirri XV — XXII, "etwas iiber 60", 
about 40 mm. long; 10 — 12 arms which, with the division series, 
are narrow and very strontrly and evenly rounded dorsally; IIBr 
series 2 (Galapagos Islands to Panama; 588—1407 Metres) ac^assizit 
d" size medium; arms 60 mm. to 95 mm. long; the ossicles of the 
division series and the lower brachials are not bordered with verj' 
prominent short blunt thorns 
e' ossicles of the division series and four or five lowest brachials 
thickly beset with very numerous fine hair-like spines; division 
series and arms narrow and very strongly rounded dorsally, only 
slightly flattened against their neighbors; cirri XL— XL\', 50, 
l^ mm. long; 10 — 11 arms 95 mm. long; IIBr series 2 (western 
Bering Sea; 1S83 Metres) vil/osa 
e" dorsal surface of the ossicles of the division series and lower 
brachials nearly or quite devoid of spines; division series and 
arm bases broad, very slightly convex dorsally, broadly and 
sharply flattened against their neighbors 
f^ ossicles of the IBr series and first two brachials slightly 
carinate and more or less fringed with small spines; a few 
spines on the dorsal .surface of the segments, particularly 
on the low rounded median keel; cirri XX, 50 — 55, 30 mm. 
long; 10 arms 60 mm. long (Mean gis Islands; 900 Metres) pergracilis 
f- ossicles of the IBr series and first two brachials swollen in 
the centre, but not carinate, and without spines; cirri XII — XV, 
50, 30 mm. long; 10 — 12 arms 60 mm. long (Portugal 
to the Canary Islands; 900 — 2165 Metres). . . . bisitanica 
c- cirri arranged in 10 definite columns, tw^o in each radial area of the 
centrodorsal ; the radial areas of the centrodorsal are well differentiated 
d' 34 — 46 cirrus segments; 10 arms only 
e* IBrj with the distal edge prominently everted and with about 
si.x or eight irregular dentations which have numerous fine spines 
at their tips; axillaries with the proximal edge like the distal 
edge of the IBr^, and the distal edge with a more regular 
finely spinous margin; cirri XX, 34 — 46, 40 mm. long (Mal- 
dive Islands; 378 Metres) niarginata 
e- no eversion of the borders of the ossicles of the IBr series, or 
of the first two brachials, which are not carinate, but are 
uniformly beset with very fine spines; basal portion of the 
animal constricted; cirri XX, about 40 ; arms 40 mm. long 
(southern Japan; 621 Metres) latipinna 
