I 26 
Oligometrides A. H. Clark. 
I. Oligometrides adeotiae (Lamarck). 
Lamarck. Hist. nat. des animaux sans vertebres, vol. 2, 1816, p. 535 [Comattda adeonae). 
Bell. "Alert" Report, 1884, p. 156 [Antedon adeonae and A. pinniformis); p. 158, pi. 11, 
figs. Art — c {Antedon bidens). 
DoDERLElN. Denkschr. der medicin.-naturwiss. Gesellsch. Jena, vol. S, 1898, p. 476, pi. 36, 
figs. 3 — T^d [Antedon bidens). 
A. H. Clark. Zool. Anzeiger, vol. 34, 1909, N'^ 11 12, p. 368 [Oligometra bidens). 
Bull, du Mus. d'hist. nat., Paris, 191 1, N'^ 4, p. 255 [Oligometra adeonae). 
The Recent Crinoids of Australia, 191 1, p. 776 [Oligometra adeonae). 
Crinoids of the Indian Ocean, 1912, p. 175 [Oligometra adeonae). 
Ann. and Mag. I^at. Hist., series 8, vol. 10, 19 12, p. 40 [Oligometra marginata). 
ReichenspergER. Abhandl. der Senck. Naturforsch. Ges., vol. 35, 1913, part i, p. 105 [Oligo- 
metra adeonae). 
A. H. Cl.\rk. Smithsonian Miscellaneous Collections, vol. 6r, 1913, N" 15, p. 37. 
H. L. Clark. Carnegie Institution of Washington Publication N" 212, 191 5, p. 105 [Oligo- 
metra anisa). 
Stat. 273. Anchorage oft' Pulu Jedan, east coast of the Aru Islands (Pearl Banks). 13 Metres. 8 Ex. 
Stat. 305. Mid-channel in Solor Strait, oft" Kampong Menanga. 113 Metres, i Ex. 
The most perfect specimen from Stat. 273 may be described as follows: 
The 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, from the third, fourth or hith 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 specimen of oz/Vomf/Wt/w The lo arms are about 50 mm. long; the ossicles of 
adeonae from Stat. 273 viewed (a) dorsally . ,. ii-i ijj 
and (/<) laterally. X 5- (Courtesy of the U.S. the IBr Series and the first two brachials are broad, and are 
National Museum). j^ close lateral apposition all along their edges. The IBr series 
and arm bases of this species are most strikingly similar to those of the species of Tropioinetra. 
Pj is the longest and stoutest 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, for its whole length; P, is 6.5 mm. long with 12 
segments, similar to P^ but proportionately less stout; P., is 5.5 mm. long with 10 segments, 
similar to P^ ; these three pinnules are considerably stiffened. P^ is 4 mm. long with 12 seg- 
ments of which the first 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 ; 
the pinnule is slightly less stout basally than P., and tapers more rapidly; it is weak and not 
stiffened; the following pinnules have more numerous and shorter segments. Pj^ is 4.5 mm. 
