427 
of the edges of the ossicles, which are smooth or show only traces of 
very minute spines. 
The cirri are 37 mm long with 62—65 segments. 
Type Locality. — »Siboga« Station No. 211. 
Crotalometra sulcata sp. nov. 
The general structure of this species resembles that of C. propinqua, 
but the cirri are proportionately larger, longer and more robust, 60 mm 
to 65 mm long with 63—64 segments, and the ossicles of the [Br series 
and lower brachials are almost smooth as in C. vera. It differs mark- 
edly from both of these in having the distal angles of the IBr, and the 
proximal angles of the axillaries, and the corresponding angles of the 
first two brachials and of the elements of the first syzygial pair, widely 
cut away forming large and prominent rhombic water pores; the edges 
of the ossicles bordering these water pores are more or less everted and 
coarsely denticulate, or bear a few coarse spines. 
Type Locality. — »Siboga« Station No. 161. 
Crotalometra vera sp. nov. 
This species is closely related to C. propinqua; the edges of the seg- 
ments of the [Br series and of the earlier brachials are but very slightly 
if at all everted, and are armed with exceedingly fine spines or are quite 
smooth; the spines within the distal angle of the axillary and on the 
dorsal surface of the ossicles are exceedingly short and fine and difficult 
to detect. 
The type has ten arms about 130 mm long; the cirri are 60 mm 
long and are composed of 62—69 segments of which the longest are 
from one third to one half again as long as broad; the sixth or seventh 
is a transition segment. 
Type Locality. — »Siboga« Station No. 173. 
Cosmiometra helene sp. nov. 
The centrodorsal is moderate in size, truncated conical, about 
4,5 mm broad at the base and about 2,5 mm high interradially; the cirrus 
sockets are arranged in ten columns of two or three each, the columns 
being close together interradially but separated in the midradial line 
by a wedge-shaped area at first about as broad as a cirrus socket but 
coming to an apex just beyond the last socket in the adjacent columns; 
this bare area is entirely covered with fine more or less sharp granu- 
lations; the dorsal pole is irregular, 2 mm in diameter. 
The cirri are XXV, 53—61, 37 mm to 47 mm long, moderately 
stout; the longest segments are half again as long as broad or slightly 
longer; the sixth is a transition segment. 
