259 
The IHr, (axillaries) are nearly as broad as lon.a, almost triangular, the lateral angles 
just in apposition with the lateral angles of the adjacent axillaries. and bear a moderately 
developed rounded posterior process. 
The edges of the ossicles of tiic IBr series and of the brachials are prominently everted 
and spinous; the dorsal surface of the lower brachials is also more or less thickly covered 
with very fine spines. There is a faint shallow median groove on the IBr, and IBr,,. 
The ends of the proximal cirrus segments are very spinous, and their dorsal surface is 
slightly carinate. 
Pj is excessively delicate; the segments after the third are greatly elongated with 
expanded and finely spinous distal ends. 
2. Toiirojiietra reinota (P. H. Carpenter). 
P. H. Carpenter. "Challenger" Reports. Comatulae, 1888, p. 1S4. pi. 29, fiys. 5 — 9 [Antcdon 
reinota). 
A. H. Ce.vrk. Smithsonian Miscellaneous Collections, vol. 61, 1913, N" 15, p. 66 {Thattmato- 
inetra rctnota). 
II. Family PEXT.\MErROCRiNir).\E A. H. Clark. 
Key to the Genera of the Pentametrocrinidae. 
a' Ten radials and ten (undivided) arms Thaumatocrinus 
a- P^ive radials and five (undivided) arms Pentametrocrinus 
Thaumatocrinus P. H. Carpenter. 
Key to the Species of the Genus Thaun\atocrinus. 
a^ Small species with a small centrodorsal which bears fewer than twenty cirri 
b^ cirri XV — XX, e.xcessively slender, with enormously elongated segments of 
which the third is about four times as long as the diameter of the expanded 
proximal end, and the fourth is six times as long as its proximal diameter 
(e X t r e m e s o u t h o f t h e I n d i a n O c e a n) renovaiiis *) 
b'- cirri XI — XIII (very rarely more), slender, but not excessively so, with less 
elongated segments than in the preceding, the third never being more than 
twice as long as broad, and the fourth usually less than four times as 
long as the diameter of the expanded ends (southwest of Iceland) . Jnngerseni 
a- Larger species with a large and broad centrodorsal which bears more than 
forty cirri 
b' second brachial more tlian twice as long as the first, which is dispropor- 
tionately small (so u th er n J a pa n) borcalis 
l) Synonym Piomachocrimis abyssornin P. H. Carpenter. 
