228 
and becomes flagellate distally. P., is lo mm. long with 23 segments, resembling Pj. P.. is 
9 mm. long with 21 segments, similar to, but slightly more slender than, the pinnules preceding; 
it is very slightly less stout basally, but tapers less and lacks the flagellate tip. P^ is 8 mm. 
lonuf with 18 segments and resembles P.,. 
Pj has the basal segments more cut away than P, , and P, than P.; P^ has a longer 
flagellate tip than P.,, and is in general more flexible; P, differs from P.. in the same way. 
The individual from Stat. 170 is slightly larger with a shorter centrodorsal, the sides 
of which make a slightly greater angle with each other; the centrodorsal measures 5.6 mm. in 
diameter at the base and 5.0 mm. from the apex to the interradial border; the dorsal pole 
is worn and rounded oft"; only one of the columns of cirrus sockets consists of four, but this 
appears to be due to the wear on the dorsal pole which extends basalward for a greater 
distance than usual, apparently due to the age of the specimen. 
The distance from the radials to the first syzygy is 7.8 mm.; the diameter at the level 
of the first svzygy, beyond which point the arms are lost, is 15.5 mm. 
8. Psathyrometra parva A. H. Clark. 
A. H. Cl-.^RK. Proc. U.S. National Museum, vol. 39, 191 1, p. 562 [Psathyrometra parva). 
9. Psathyrometra minima A. H. Clark. 
A. H. Cl.^RK. Notes from the Leyden Museum, vol. 34, 1912, p. 141 [Psatliyroiiictra viimvia). 
Stat. 48. 8°4'.7S., ii8°44'.3E. Flores Sea. 2060 Metres, i Ex. 
The centrodorsal is sharply conical, 1.8 mm. in diameter at the base and 1.6 mm. from 
the apex to the interradial border; somewhat irregular shallow grooves averaging about halt 
as wide as the cirrus sockets separate the sides of the centrodorsal into five radial areas each 
of which contains two closely crowded columns of cirrus sockets usually ot two each. 
The radials project very slightly beyond the edge of the centrodorsal and are strongly 
produced in the interradial angles so that they entirely separate the bases of the IBr^; the 
IBr^ are about twice as broad as long, and are deeply incised by a rounded posterior projection 
from the axillary; the IBr, (axillaries) are rhombic with strongly concave sides, about as long 
as broad, the anterior angle strongly produced, and the centre of the proximal border produced 
into a rounded process incising the distal border of the IBr,. 
The three brachials preserved resemble those of such species as Ps. congcsta but the 
synarthrial tubercles are scarcely developed. 
The distance from the apex of the centrodorsal to the first syzygy is 5.5 mm. 
10. Psathyrometra gracillima A. H. Clark. 
A. H. Clark. Proc. Biol. Soc. Washington, vol. 22, 1909, p. 149 [Psatliyrometra gracillima). 
Crinoids of the Indian Ocean, 19 12, p. 236, fig. 44, p. 237 [Psathyrometra gracillima). 
11. Psathyrometra congesta A. H. Clark. 
A. H. Clark. Proc. U.S. National Museum, vol. 34, 190S, p. 221 [Psathyrometra congesta). 
