200 
3- Mastigometra inicropoda A. H. Clark. 
A. H. Clark. Proc U. S. National Museum, vol. 36, 1909, p. 649 {Mastigometra inicropoda). 
Crinoids of the Indian Ocean, 191 2, p. 227, fig. 42, p. 228 {Mastigometra inicropoda). 
Euantedon A. H. Clark. 
Key to the. Species of the Genus Euantedon. 
a' More than 20 cirrus segments; cirri XL, 22 — 25, 15 mm. to 20 mm. long; 
Pj 7.5 mm. long with 10 + segments; P-, 6 mm. long with 10 segments; P„ 
4.5 mm. long with 11 segments; arms 100 mm. long (Tahiti; littoral) . . iahitietisis 
a'- Less than 20 (15 — 17) cirrus segments 
b' longest cirrus segments about four times as long as the median diameter ; 
after the eisfhth the cirrus segments decrease in lensfth so that the ante- 
penultimate is little, if any, longer than broad; the cirrus segments have a 
straight dorsal and ventral profile, and the ends are not swollen (Moluccas; 
397 Metres) moliiccana 
b" lonofest cirrus seg-ments from two to two and one half times as lontr as broad ; 
the pro.ximal and distal cirrus segments are subequal in length; both the 
proximal and distal ends of the segments are thickened and prominent 
(PcoastofChin a,;? littoral) sinensis 
I. Euantedon taJiitiensis nov. sp. 
The centrodorsal is very low, with a relatively large slightly convex dorsal pole 1.5 mm. 
in diameter; the cirrus sockets are arranged in about three closely crowded more or less 
irregular alternating rows. 
The cirri are XL, 22 — 25, 15 mm. to 20 mm. long; the first segment is very short, 
the second about twice as broad as long, the third about as long as broad, the fourth not 
quite twice as long as the median diameter, the fifth slightly longer, the sixth and seventh the 
longest, between two and two and one half times as long as the median diameter; the following 
very slowly decrease in length, the fourteenth or fifteenth and those succeeding being usually 
from one third to one half again as long as the median diameter, though sometimes only 
slightly longer than broad; the segment preceding the antepenultimate and the antepenultimate 
itself are longer again, about twice as long as broad; on the segments as far as the eighth 
both the dorsal and ventral profiles are equally concave, so that the articulations are prominent ; 
from this point onward the dorsal profile becomes progressively more and more concave, and 
the ventral less and less, so that the seo^ments bevond the twelfth or thirteenth have the 
ventral profile approximately straight, and the dorsal very strongly and narrowly concave so 
that both ends of the segments on the dorsal side appear very prominent; the opposing .spine 
is very small, terminal or subterminal, directed obliquely forward; the terminal claw is slightly 
shorter than the penultimate segment, moderatelj- curved. 
The distal border of the radials projects slightly beyond the rim of the centrodorsal. 
