25 7 
6. TJiauDtatomctra thysbe A. H. Clark. 
A. n. Cl.AKK. Notes from the Leyden Museum, vol. 34, 191 2, p. \j^<.) {Thaiiinatoiitclra ihysbi'). 
Stat. 52. 9'^3.4S., 1 19° 56.7 K. Savu Sea. 939 Metres, i l^x. 
The centrodursal is small, rounded conical. 
The cirri are about XL, 15 — 16, 9 mm. long; the first segment is short, the second 
about as long as tin- diameter of the expanded distal end, the third twice as long as the 
diameter of the expanded distal end, and the fourth slightly longer; the following very slowly 
decrease in length so that the last two before the penultimate are from one third to one half 
again as long as broad ; the earlier segments have greatly enlarged ends, the distal end being 
much expanded and overlapping the base of the succeeding segment; as the segments become 
shorter the dorsal and ventral profiles become straighter and the segments become compressed 
laterally so that they appear broader in lateral view ; on the distal short segments the median 
portion of the distal edge on the dorsal side projects slightly over the base of the following segment. 
In the median line the radials are just visible beyond the edge of the centrodorsal, but 
they extend well up in the angles of the calyx; their distal angles are slightly .separated so 
that the bases of the IBr, are not quite in apposition. 
The IBr, are very short, almost oblong, about four times as broad as the exterior 
length, which is slightly greater than the median length; the lateral borders of adjacent IBr, 
make an angle of about 90° with each other; the distal edges are narrowly everted and very 
finely spinous. 
The IBr, (axillaries) are about as broad as long; the distal edges make approximately 
a right angle with each other; the distal angle is not produced; a broad posterior process 
incises the IBr,; the lateral angles extend considerably beyond the distal angles of the IBr,; 
the distal edges are evenly and very finely spinous. 
The arms are 30 mm. long and resemble those of the other species of the genus; the 
distal edges of the brachials are moderately everted and finely spinous. Syzygies occur between 
the third and fourth brachials, again between the ninth and tenth and fourteenth and fifteenth, 
and distally at intervals of two oblique muscular articulations. 
P, is excessively delicate, about 6.5 mm. long, composed of 1 5 -I- segments of which 
the first is very short, the second longer, the third about as long as broad, the fourth half 
again as long as broad, the following becoming exceedingly elongated with swollen, produced 
and overlapping spinous distal ends. P, is stouter than P, , composed of 1 1 or 12 segments 
of which those beyond the third are excessively elongated, becoming exceedingly slender distally ; 
the fourth-seventh se^rments bear a lartje crenital gland. 
& 
7. Thauniatoinctra drcvicirra (.\. H. Clark). 
A. H. Cl.ARK. Proc. U. S. National :\Iuseum, vol. 34, 1908, p. 235 [Batliyinctra brevicirra). 
8. ThaiiDiatomctra parva A. H. Clark. 
A. \\. Ci..\RK. Proc. U.S. National Museum, vol. 34, 190S, p. 231 {Tliaumatometra parva). 
siiior.A-ExrtDiTii; xi.ii(>. 33 
