slio-htly longer interiorly than exteriorly, about as broad as the interior length; the next four 
brachials are slightly wedge-shaped, twice as broad as the median length, the brachials then 
becoming more obliquely wedge-shaped. Syzygies occur between the third and fourth brachials, 
ao-ain between the ninth and tenth and fourteenth and fifteenth, and distallv at intervals ot 
usually four oblique muscular articulations: but the distal intersyzygial interval can only be 
estimated as the outer part of the arms in all the specimens is lost. 
Though the animal is very small the IBr series and lower brachials are rugged, sug- 
o-esting the condition so strongly developed in the large species of the genus. 
P is exceedingly slender and delicate, with the first segment broader than long, the 
next five about as long as broad, the seventh slightly longer than broad, and the succeeding 
becomino- oreatlv elong-ated. P, is much stouter (? and longer) with the first four segments short 
but the following rapidly increasing in length and the outer exceedingly elongated. 
From Stat. 38 there is a specimen smaller than the one described. The interradial bare 
areas on the centrodorsal are almost wholly obliterated; the arrangement of the cirrus sockets 
is less regular than described, the distribution in columns being more or less obscured. 
The example from Stat. 45 is that described in detail above. 
The individual from Stat. 178 is similar to that from Stat. 38, but very slightly smaller, 
and with the bare interradial areas on the centrodorsal slightly better marked. 
A similar specimen was dredged at Stat. 314. 
Two small specimens are from Stat. 316; several broken cirri remain ; these are of the 
type characteristic of the genus; the longest is 19 mm. long with 21 segments of which the 
proximal are about four times as long as the expanded distal ends, and the outer about as 
long, but with unmodified distal ends; the cirri are slender, but not excessively so, and taper 
distally to a point. 
The arrangement of the obsolete cirrus sockets about the tip of the centrodorsal in 
alternating rows rather than in columns is very interesting in indicating the possible course of 
development of the centrodorsal characteristic of the Zejtoinetrifiae through the type common 
to the other groups in the Macrop/wcafa, especially of the Bathymetrinae. 
The entirely smooth ossicles of the division series and brachials of the species of this 
genus, even of the smallest, are very characteristic. 
13. Psathyrometra antarciica A. H. Clark. 
A. H. Clark. Die Crinoiden der Aiitarktis, 1915, p. 116, pi. 2, figs, la, \b [Psathyrometra 
antarctica). 
14. Psathyroinetra anoniala A. H. Clark. 
A. H. Cl.\KK. Notes from the Leyden Museum, vol. 34, 191 2, p. 143 [Psatliyrometra anoiiialu). 
Stat. 211. 5°4o'.7S., I20°45'.5 E. Banda Sea. ii5l:5 Metres, i E.v. 
The centrodorsal is low, rounded conical, 1.7 mm. in diameter at the base and about 
i.o mm. from the apex of the dorsal pole to the interradial margin; there are twenty large 
