460 THE VOYAGE OF H.M.S. CHALLENGER. 
Localities. —*‘ Porcupine” Expedition : 
Station 52, 1869. Inthe Faerde Channel. Lat. 60° 25’ N., long. 8° 10’ W. Depth 
384 fathoms. Bottom temperature —0°°8 C.; surface temperature 11°'2 C. 
Station 55,' 1869. In the Faerée Channel. Lat. 60° 4’ N., long. 6° 19’ W. Depth 
605 fathoms. Bottom temperature — 1°-2 C.; surface temperature 11°4 C. 
2. Lophaster stellans, n. sp. (PJ. LXXI. figs. 4 and 5; PJ. LXXII. figs. 11 and 12). 
Rays five. R=382 mm.; r=1l1 mm. R<3 7. Breadth of a ray at the base, 12 
to 13 mm. 
The rays are broad at the base, and taper gradually therefrom up to the extremity. 
The abactinal surface is convex over the disk and upon the rays, and tapers regularly to 
the extremity. The actinal surface is plane. The interbrachial arcs though wide are 
angular; and im consequence of the height and convexity of the disk, the declivity there 
at the summit of the arc is rapid. 
The abactinal surface is beset with well-developed paxille, which are widely spaced 
and arranged with more or less regularity in longitudinal lines along the rays. The 
paxillze have a thick, robust, skin-covered pedicle, and are surmounted by a crown of 
five to eight moderately robust subequal spinelets, with denticulate tips, usually shorter 
than the pedicle, which radiate widely apart, and, when well preserved, have a strongly 
marked stellate character; whence the name of the species. Numerous papule are 
present in the interspaces, usually in groups of four or five, or more. 
The supero-marginal plates are well developed, and bear robust paxillze with long 
pedicles, similar to those on the abactinal surface, excepting that the pedicles are longer 
and thicker. The infero-marginal plates bear still larger paxilla, which are surmounted 
by a crown of rather more numerous spinelets. The rotundity of the pedicle is main- 
tained, and there is no modification in the form of the paxille. The paxillee are well 
spaced, and there are about eighteen between the median interradial line and the 
extremity. 
The adambulacral plates are large, and are separated superficially by channels or 
wrinkles in the membrane with which the whole actinal surface is invested, passing 
obliquely from the furrow to the margin. Their armature consists of two series of spines. 
(1.) A furrow series of rather large but delicate, tapering, skin-covered spines, which 
radiate apart, and are partially united by web, forming a fan parallel to the furrow. 
Near the mouth five spinelets are present in each comb, but the number is successively 
reduced to four, three, and two, as they proceed along the ray, and probably only one 
spine is present at the extremity. (2.) On the actinal surface of the plate is a lineal 
transverse series of three (occasionally four near the mouth) large, robust, tapering, skin- 
1 This occurrence is recorded in Sir Wyville Thomson’s Depths of the Sea, but I have not seen an example 
from this station. 
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