2l8 
Thysanometra A. II. Clark. 
Key to the Species of the Genus Thysanometra. 
a^ Brachials following the second syzygy wedge-shaped, twice as broad as long, 
soon becoming oblong, much broader than long; arms i lo mm. long; cirri 
LX — LXX, 15 — 17, 35 mm. long; P, 14 mm. long with 35 — 40 short segments ; 
P, 10 mm. long with 20 segments of which all but the basal three or four are 
much elongated (southern Japan; 126 — 355 Metres) tenel hides 
a- Brachials beyond the second s)-zygy triangular, as long as broad, in the outer 
part of the arm becoming very obliquely wedge-shaped and longer than broad ; 
arms 55 mm. long; cirri XXX -f-. 15 — 25-)-; P„ about the same length as Pj, 
but composed of stouter and more elongate segments (Admiralty Islands; 
270' Metres) tenuicirra 
1. Tliysanometra tcticlioides (A. H. Clark). 
A. H. Clark. Proc. U. S. National Museum, vol. 33, 1907, p. Ji [Antedon tenclloides). 
2. Thysajiomeira tenuicirra (P. H. Carpenter). 
P. H. Carpenter. "Challenger" Reports. Comatulae, 1888, p. 186, pi. 30, figs. 4 — 8; pi. 33, 
fig. 4 — 5 ; [Antcdon tenuicirra). 
A. H. Clark. Smithsonian Miscellaneous Collections, vol. 61, 1913, N" 15, p. 64 [Thysano- 
metra tenuicirra). 
There is an unrecorded specimen of this species in the collection of the U. S. National 
Museum (Cat. N" 36012) which was collected by the "Albatross" at Stat. 5221, between 
Marinduque and Luzon, Philippine Islands, in 347 Metres. 
Coccometra A. H. Clark. 
Key to the Species of the Genus Coccometra. 
a' 24 — 28 cirrus segments; cirri very slender, with the fourth and following- 
segments greatly elongated, four to five or more times as long as broad; 
terminal claw straight, tapering to a sharp point; arms 60 mm. to 70 mm. 
long; there is a large black spot on either side of each syzygial pair; P^ 9 mm. 
long with 35 — 40 segments; P, 5 mm. long with 12 — 15 segments (south- 
eastofSantiagodeCuba: 455 Metres) guttata 
a" Not more than 25 cirrus segments of which the distalmost are much shorter 
than the elongate proximal, the penultimate being about as long as broad 
and the antepenultimate and at least one of those immediately preceding being 
much less than twice as long as broad ; terminal claw recurved 
b^ segments in the distal half of P^ very short, like those in the pro.ximal 
half; no black markings; ossicles of the division series and lower brachials 
