[26 



Oligometrides A. il l '.ark. 



i Oligometrides adeonat (Lamarck) 



Lamarck. Hist. n.it. des animaux s.ms vertèbres, vol. 2, [8i6, i>. 535 [Comatula adeonae). 

 BELL. "Alert" RciM.it. [884, p. 156 [Antedon adeonae and A. pinniformis); p. 158, pi. ir, 



\.i — <■ (Antedon bidens). 

 DöDERLEIN. Denkschr. der medicin.-naturwiss. Gesellsch. Jena, vol. 8, 1898, p. 476, pi. 36, 



ii;4>. 3 — 3</ (Antedon bidens). 

 A. II. Clark. Zool. Anzeiger, vol. (4, !o<>.,. N 11 12, p. 368 (Oligometra bidens). 



Buil. du Mus. d'hist. nat., Paris, 1911, X" 4, p. 255 (Oligometra adeonae). 



■ The Recent Crinoids of Australia, iyu, p. jjC> (Oligometra <i<lr<>init'). 



Crinoids of the Indian Ocean, 191 2, p. 175 (Oligometra adeonae). 



— — Ann. and Mag. Nat. I list., series S, vol. io, 1912, p. 40 (Oligometra tnarginata). 



R.EH HENSPERGER. Abhandl. der Senck. Xaturforsch. Ges., vol. 35, 1913, part 1, p. 105 [Oligo- 



metra adeonae). 

 A. H. CLARK. Smithsonian Miscellaneous Collections, vol. 61, 1913, X" 15, p. t,j. 

 II. I.. CLARK. Carnegie Institution of Washington 1'ublication X"2I2, 1915, p. 105 (Oligo- 



metra anisa). 



Stat. 2JI. Anchorage off Pulu Jedan, east coast of the Aru Islands (Pearl Banks). 13 Mctres. 8 Ex. 

 Mat. 305. Mid-channel in Solor Strait, off Kampong Menanga. 113 Metres. 1 Ex. 



The most perfect specimen from Stat. 273 may be described as follows : 

 I he centrodorsal is small, discoidal, the dorsal pole papillose, 1.5 mm. to 2.0 mm. in 

 diameter; the cirrus sockets are arranged in one and a partial second marginal rows. 



The cirri are XVI, 20, about 10 mm. long; the cirrus 

 segments are, trom the third, fourth or htth onward, about as 

 long as broad; on the fourth or fifth and following two trans- 

 verse ridges, a proximal and a distal, are developed, which 

 in a lateral view appear as two small dorsal spines. 

 a cirrus from a >pecimen of oiigenutriJcs The 10 arms are about 50 mm. long ; the ossicles of 



adcomit from Stat. 273 viewed (a) dorsally . . . 



and (#) laterally, x 5- (Courtcsy of the u.s. the IBr series and the hrst two brachials are broad, and are 

 National Museum j n c i ose i a t e ral apposition all along their edges. The IBr series 



and arm bases of this species are most strikingly similar to those of the species of Tropiometra. 

 I', is the longest and stóutest pinnule, 8 mm. long with 13 segments of which the first 

 is slightly broader than long, the second is trapezoidal, tapering distally, slightly longer than 

 the proximal (greater) width, the third is about twice as long as the proximal width, the fourth 

 and fifth about three times as long as broad, and the remainder from two to two and one 

 half times as long as broad; the pinnule tapers evenly from the base to the tip, and is distinctly 

 prismatic, with the dorsal ridge rounded, tor its whole length; P, is 6.5 mm. long with 12 

 segments, similar to 1', but proportionately less stout: P is £.5 mm. long with 10 segments, 

 similar to I se three pinnules are consideraMy stiffened. P, is 4 mm. long with 12 seg- 



ments of which the tirst is over twice as broad as long and the following gradually increase 

 in length becoming about as long as broad on the fourth and twice as long as broad distally; 

 pinnule is slightly less stout basally than P and tapers more rapidly; it is weak and not 

 the following pinnules have more numerous and shorter segments. P, is 4.5 mm. 



