149 
a- Centroclorsal truncated conical, the cirri arranged in ten columns, two in each 
radial area; 60 — 70 cirrus segments 
b' brachials after the proximal third of the arm with the central portion of 
the distal edge produced into long overlapping spines which are more or 
less flattened dorsoventrally and rounded or truncated at the tip; 12 — 16 
arms (Laccadive Islands; 1265 Metres) scut if era 
\? brachials with the distal borders not provided with long overlapping si)ines 
c^ 70 or more cirrus segments (Malay Archipelago and the Philip- 
pine Islands; 54 — 414 Metres) rjtstica 
c- 60 — 63 cirrus segments 
d^ radials concealed by a narrow rim about the proximal margin of the 
IBr^; ends of the basal rays very prominent as high dorsoventrally 
elongate tubercles which are usually rather longer than the dorsoventral 
length of a cirrus socket; sides of the IBr, in the interradial angles 
cut away to accomodate the ends of the basal rays; 17 — 18 arms 
(Moluccas; 1595 Metres) marginalis 
d- no produced proximal border on the IBrj concealing the radials, which 
form a closed ring about the calyx separating the ends of the basal 
rays from the IBr, (South Africa; 540 — 810 Metres). . . . magnicirra 
1. Crotaloinetra Jlava (Koehler). 
KOEHLER. Revue biol. du nord de la France, vol. 7, 1895, p. 475 [Antedon flava). 
et VaNEV. Bull, du Mus. d'hist. nat., Paris, 1910, N" i, p. 31 [Antedon [Crotaloinetra] flava). 
A. H. Clark. Proc. U.S. National Museum, vol. 40, 191 1, p. 37 (Crotaloinetra flava). 
2. Crotaloinetra porrecta (P. H. Carpenter). 
P. H. Carpenter. "Challenger" Reports. Comatulae, 1888, p. 250, pi. 52, figs. 3— 5 (Antedon 
porrecta). 
Koehler et Vanev. Bull, du Mus. d'hist. nat., Paris, 1910, N" i, p. 32 (Antedon [Crotalo- 
inetra] porrecta). 
A. H. Clark. Proc. U.S. National Museum, vol. 40, 191 1, p. 37 (Crotaloinetra porrecta). 
Smithsonian Miscellaneous Collections, vol. 6[, 1913, N" 15, ^. ifi (Crotaloinetra porrecta). 
3. Crotalonietra sentifcra A. \\. Clark. 
A. H. Clark. Proc. Biol. Soc. Washington, vol. 22, 1909, p. 147 (Crotaloinetra sentifera). 
Crinoids of the Indian Ocean, 1912, p. 201, fig. 37, p. 202 (Thalassometra sentifcra). 
4. Crotaloinetra rustic a A. H. Clark. 
A. H. Clark. Proc. Biol. Soc. Washington, vol. 22, 1909, p. 80 (Crotaloinetra rustica). 
Proc. U.S. National Museum, vol. 39, 1911, p. 5 50 (Crotalometra infeli.v). 
Crinoids of the Indian Ocean, 1912, p. 198, fig. 36, p. 199 (Thalassometra rustica); 
p. 203 (Thalassometra infeli.v). 
