258 
g. Thaumatometra septenirionalis A. H. Clark. 
A. H. Clakk. Die Crinoiden der Antaiktis, 191 5, p. 147 ("unbeiianntc Art vom Gebict sLid- 
westlich vou Island"). 
Description in press. 
iQ. Thmiviatovictra plana (A. H. Claris). 
A. H. Clark. Crinoids of the Indian Ocean, 19 12, p. 240 {Tric/ioiiietra plana). 
Orthometra A. H. Clark. 
The only species in the genus Orf/wi)ic/ra is 
I. Orthometra hibcrnica (A. H. Clark). 
A. H. Clark. Fisheries, Ireland, Sci. Invest., 191 2, N" 4, p. 2 [Tricliometra Itibeniica). 
Tonrometra A. H. Clark. 
Key to the Species of the Genus Tonrometra. 
a^ None of the cirrus segments longer than the diameter of the much expanded 
distal ends; arms 10 mm. long; cirri XXX, 18 — 20, 4 mm. long (east of Hal- 
mahera [Gilolo]; 1089 Metres) brevipes 
a- Longest proximal cirrus segments longer than the diameter of the much expanded 
distal ends; arms probably about 40 mm. long; cirri XX — XXX, nearly 20 
(between Marion Island and the Croze ts; 2 8 So Metres) . . . . . rcDiota 
I. Tonrometra brevipes (A. H. Clark). 
A. H. Clark. Notes from the Leyden Museum, vol. 34, 1912, p. 147 [Triclioutctra brevipes). 
Stat. .150. o°o6N., 129°/'. 2 E. Halmahera Sea. 10S9 Metres, i Ex. 
The centrodorsal is low conical, twice as broad basally as high, bearing about thirty 
closely crowded and irregularly placed cirrus sockets which have very prominent rims. 
The cirri are about XXX, iS — 20, about 4 mm. long; the first segment is very short, 
the second is about as long as the median diameter, the third-fifth or -sixth are the longest, 
about as long as the diameter of the expanded di.stal ends; the ibllowing gradually decrease 
in length so that the outermost nine or ten are slightly broader than long; the longer earlier 
segments are constricted centrally with greatly expanded and overlapping distal ends, this 
feature rapidly decreasing as the segments become shorter : the short outer segments are sub- 
carinate dorsally, and bear a slight dorsal spine. 
The radials are concealed by the centrodorsal. 
The IBr^ are extremely short, and are in close lateral apposition ; the lateral edges are 
slightly everted. 
