128 
reaching 4.5 mm. or 5.0 mm. distally with 13 segments of which the majority are between two 
and three times as long as broad. 
The colour, as preserved, is white. 
Cotylometra A. H. Clark. 
Key to the Species of the Genus Cotylometra. 
a^ The ossicles of the IBr series and the brachials in the proximal third of the 
arm each bear a narrow rounded median keel which on the first brachial may 
be reduced to a prominent tubercle; the outer edges of the ossicles of the 
division series and the first two brachials are bordered with a row of thickly 
set tubercles or small spines (Philip pinelslands) ornata 
a^ No keel on the IBr series and arms; edges of the ossicles of the IBr series and 
first two brachials unmodified (Andaman to the Lesser Sunda and 
Philippinelslands) ' gj'acilicirra 
I. Cotylometra gracilicirra (A. H. Clark). 
A. H. Clark. Smithsonian Miscellaneous Collections, vol. 52, 1908, part 2, p. 221 [Oligometra 
gracilicirra). 
Crinoids of the Indian Ocean, 191 2, p. 168, fig. 26, p. 169 [Oligometra gracilicirra). 
Stat. 260. 5°36'.5S., i32°55'.2E. Near Kei Islands. 90 Metres. 2 Ex. 
Stat. 305. Mid-channel in Solor Strait, off Kampong Menanga. 113 Metres. 2 Ex. 
The examples from Stat. 260 are both small, with an arm length of 40 mm.; in one 
the cirri have 31 — -36 segments, and P^ has 12 — 13 (usually the latter) segments; P,; is absent 
from all the arms; in the other P^ is present. 
One of the specimens from Stat. 305 has the arms 80 mm. long and the cirri IX (with 
a few undeveloped), 28 — 31, 15 mm. long; P„ has 10 segments. The other has arms 85 mm. 
long. Pa is absent. 
These specimens agree perfectly with the type, even in the details of the colouration ; 
they are, however, slightly larger. 
Oligometra A. H. Clark. 
Key to the Species of the Genus Oligometra. 
a^ The distal edges of the brachials in the proximal third of the arm are 
prominently everted 
b^ the distal edges of the brachials in the proximal third of the arm are turned 
abruptly outward and greatly produced; their crest is scalloped and irregular; 
proximal to the second syzygy this eversion becomes restricted to the central 
portion of the distal edge of the ossicles, and may be more or less resolved 
into high tubercles or blunt spines; the synarthrial tubercles are strongly 
