251 



angles are just in contact interiorly forming, with the widely diverging inner edges of the first 

 brachials, large rhombic water pores resembling those between the IBr series. 



The first syzygial pair (third and fourth brachials) is slightly longer inwardly than outwardly. 



The remainder of the arm is as in other species of the genus ; the eversion of the distal 

 edges of the brachials is only slightly developed, and the spinosity is very fine. 



Pj has the first threè segments broader than long, the fourth and fifth slightly longer 

 than broad, and the remainder elongated, very greatly so distally. 



Nepiometra A. H. Clark. 



Key to the species of the Genus Nepiometra. 



a 1 Centrodorsal relatively large, 3.5 mm. in diameter at the base; IBi^ with the distal 

 angles rounded off so that the lateral angles of the axillaries project bevond them 

 forming prominent water pores (sou th west of Cape Comorin, the southern 



tip of India; 774 Metres) obscura 



a 3 Smaller, with a relatively smaller centrodorsal which is never more than 3.0 mm. 

 in diameter at the base 

 b 1 25 — 30 cirrus segments 



c 1 larger, arms about 60 mm. long; cirri L — LX; earlier cirrus segments three 

 times as long as the median diameter or even somewhat longer (Kei Is- 



lands; 204 Metres) alcyon 



c 3 smaller, arms about 25 mm. long; cirri about XXX; earlier cirrus segments 



not more than twice as long as broad (Meangis Islands; 900 Metres) laevis 

 b 3 20 — 22 cirrus segments of which the loneest are twice as lono- as the diameter 

 of the expanded distal ends; arms about 30 mm. long; distal intersyzygial inter- 

 val two oblique muscular articulations 



c 1 last four or five cirrus segments very slightly longer than broad; IBr series 

 and first two brachials with straight sides which are just in contact laterally 



(off southern Celebes; 1158 Metres) io 



c 3 last eleven cirrus segments broader than long; IBr series free laterally (Co cos 



I si and, off Panama; 1760 Metres) parvula 



1. Nepiometra obscura (A. H. Clark). 



A. H. CLARK. Crinoids of the Indian Ocean, 1912, p. 240, fig. 45 {Tricliometra obscura]. 



2. Nepiometra alcyon (A. H. Clark). 



A. H. Clark. Notes from the Leyden Museum, vol. 34, 191 2 [Thaumatometra alcyon). 



Stat. 251. 5°28'.4S., i32°o'.2 E. Arafura Sea. 204 Metres. 1 Ex. 

 The centrodorsal is conical with the sides slightly rounded, half again as broad at the 

 base as high, almost entirely covered with closely crowded cirrus sockets arranged in alternating 

 rows as in Tricliometra and Hatliromctra. 



