2 3' ' 



slightly longer interiorly than exteriorly, about as broad as the interior length; the next four 

 brachiak are slightly « twice as broad as the median length, the brachials then 



oming more obliquely w iped. Syzygies occur between the third and fourth brachials, 



again between the ninth and tenth and fourteenth and fifteenth, and distally at intervals ol 

 usually tour oblique muscular articulations : bul the (listal intersyzygial interval can only be 

 timated as the out of the arms in all the specimens is lust. 



Thouefh the animal is very small the IBr series and low<r brachials are ruereed, suer- 

 ting the condition so strongly developed in the large species of the genus. 



1' is ingly slender and delicate, with the lirst segment l>n>ader than lon^f. i 



next five about as long as broad, the seventh slightly longer than broad, and the succeeding 

 :oming greatly elongated. 1', is much stouter (rand longer) with the first tour 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 

 are. is on the centrodorsal are almost wholly obliterated; the arrangement of the cirrus sockets 

 iilar than described, the distribution in columns being more or less obscured. 

 e example trom Stat. 45 is that described in detail above. 

 The individual from Stat. 1 78 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. 



Tun 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 unmoditied distal ends; the cirri are slender, but not excessivelv 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 Zenometrinae through the type common 

 to the other groups in the Macrophreata, especially of the Bathymetrinae. 



The entirely smooth ossicles of the division series and brachials of the species of this 

 nis, even of the smallest, are very characteristic. 



[3. Psathyrometra antarctica \. H. Clark. 



A. H. Cl/ Crinoiden der Antarktis, 1915, p. 116, pi. 2, figs. la, 16 [Psathyrometra 



nut l) 



1 .}. Psathyrometra anomala \. H. Clark. 



A. H. CLARK. Notes from the Leyden Museum, vol. 34, 1912, p. 143 [Psathyrometra anomala). 



Stat. 211. 5 40.7 S., i l Sea. 115S Metres. 1 Ex. 



The centrodorsal is low, rounded conical, 1.7 mm. in diameter at the base and about 

 mm. in.m the apex of the dorsal pol to the interradial margin; there are twenty large 



