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 IHr 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. 
P, has the first three 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' Centrodorsal relatively large, 3.5 mm. in diameter at the base; IBrj with the distal 
angles rounded oft' so that the lateral angles of the axillaries project beyond them 
forming ])roniinent water pores (southwest of Cape Com or in, the southern 
tip of India; 774 Metres) obsciira 
a- Smaller, with a relatively smaller centrodorsal which is never more than 3.0 mm. 
in diameter at the base 
b^ 25 — 30 cirrus segments 
c' 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" 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" 20 — 22 cirrus segrments of which the lonoest are twice as longf as the diameter 
of the expanded distal ends; arms about 30 mm. long; distal intersyzygial inter- 
val two oblique muscular articulations 
c^ 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 
(of f so u t h e r n C e leb es; 1 1 58 Metres) io 
c" last eleven cirrus segments broader than long; IBr series free laterally (Co cos 
Island, off Panama; 1760 Metres) pixrviila 
1. Nepio))ietra obsctira (A. H. Clark). 
A. H. Cl.\RK. Crinoids of the Indian Ocean, 19 12, p. 240, fig. 45 {Triclioiiutra obsciira). 
2. A^epiometra alcyon (A. H. Clark). 
A. H. Clark. Notes from the Leyden Museum, vol. 34, 1912 [Thaiiinatoinetra alcyon). 
Stat. 251. 5°28'.4S., 132° 0.2 E. Arafura Sea. 204 Metres, i 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 Trichoinetra and Ilathrovtetra. 
