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. 



ITie colour, as preserved, is white. 



Cotylometra A. II. 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 s 

 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 pi ne Islands) ornata 



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 Sun da and 

 Philippine Islands) gracilicirra 



1. Cotylometra gracilicirra (A. H. Clark). 



A. II. CLARK. Smithsonian Miscellaneous Collections, vol. 52, 1908, part 2, p. 221 (Oligometra 



gracilicirra). 

 Crinoids of the Indian Occan, 191 2, p. 168, fig. 26, p. 169 {Oligometra gracilicirra). 



Stat. 260. 5 36.5 S., 132°55'.2P2. Near Kei Islands. 90 Metres. 2 Ex. 



Stat. 305. Mid-channcl 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 a is absent 

 from all the arms; in the other 1'.. is present. 



< >ne 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. P„ is absent. 



These specimens agree perfectly with the type, even in the details of the colouration; 

 they are, however, slightly larger. 



Oligometra A. 11. Clark. 

 Key to the Species of the Genus Oligometra. 



a 1 The distal edges of the brachials in the proximal third <>f tin- arm are 



prominently everted 



b' the distal edges of the brachials in the proximal third of the arm are turned 

 abruptly ontward and greatly produced ; their crest is scalloped and irregular; 

 proximal to the second syzygy this eversion becomes nstricted to the central 

 portion of the distal edge <»l the ossicles, and may be more or less resolved 

 into high tubercles or blunt spines; the synarthrial tubercles are strongly 



