i69 
including the more broadly rounded median keel, which 
grade insensibly into those on the slightly everted borders 
of these segments (Postilion Islands; 794 Metres). innri;;ari/ifcra 
1. 'rJuxlassoiiietra margaritifcra A. H. Clark. 
A. H. Clark. Zool. Anzeiger, vol. 39, 1912, \" 11 12, p. 426 [Tlialassouutra inargaritifeni). 
Stat. 45. 7^24' S., iiS°i5.2E. Floics Sea. 794 Metres. 2 Ex. 
This species is very closely related to 77/. hirsiita\ the eversion of the [jro.ximal and 
distal edofes of the ossicles of the IBr series and of the first two brachials is less marked than 
in TJi. Iiirsuta aiul the spinosity is coarser, the spines being more uniform in size and more 
thicklv distributed over the dorsal surface of the segments; they are also longer, so that there 
is less difference between the spines of the dorsal surface and those of the everted edges; the 
median carination is more rounded than that of TIi. hirsiita, and is studded with spines 
resembling those of the general dorsal surface. 
The cirri are about 4;^ mm. long, with somewhat more that 57 segments: the arms are 
about 95 mm. long, in hirsuta being 95 mm. to 100 mm. long. 
2. Thalassometra hirsuta .A. H. Clark. 
A. H. Clark. Proc. U.S. Xational Museum, vol. 39, 191 1, p. 552 {Thalassometra hirsuta). 
Stat. 85. o°36'.5S., 119° 29.5 E. Makassar Straits. 724 Metres. 7 Ex. 
Stat. 286. 8° 50.2 S., 1 27° 2.2 E. Timor Sea. 883 Metres, i Ex. 
• A specimen from Stat. 85 may be described as follows: 
The centrodorsal is small, low, rounded conical; the dorsal pole is thickly studded with 
small more or less sharpened papillae; the cirrus sockets are arranged in ten columns, closely 
crowded, of two sockets each. 
The cirri are XX, 60—64, 40 mm. to 45 mm. long; the longest pro.ximal cirrus 
segments are from two and one half to three times as long as broad; the eversion of the 
distal edees of the segments betjins on the fith or sixth. 
The dorsal surface of the ossicles of the IBr series and of the first two brachials is 
uniformly and rather thickly covered with short fine spines; their proximal and distal edges are 
everted and armed with very numerous fine spines which are more closely set and longer than 
those on the dorsal surface; the IBrj and the proximal half of the median line of the axillary 
bears a moderately sharp, though low, median keel which is studded with slender spines; 
more or less complete reduplications of this keel occur on the first two brachials; beyond the 
first syzygy the spines become finer, shorter, more thickly set, and more evenly distributed, as the 
ends of the brachials become oblique gradually giving way the finely serrate longitudinal striations. 
The base of the animal is moderately compact, the outer edges of the ossicles of the 
IBr series and lower brachials being straight and in close apposition. Rather small water 
pores are present. 
SIBOGA-KXPEIJITIE Xl.lIiS. ^" 
