REPORT ON THE ASTEROIDEA, A87 
Locality.—Station 286. In the Mid-South Pacific, near the meridian of 135° W., 
approximately midway between Sydney and Valparaiso. October 16, 1875. Lat. 33° 
29’ 0” S., long. 133° 220” W. Depth 2335 fathoms. Red clay. Bottom temperature 
34°°8 Fahr. ; surface temperature 63°°0 Fahr. 
2. Marsipaster hirsutus, Sladen (Pl. LXXVIII. figs. 3 and 4; Pl. LXXIX. 
figs. 4-6). 
Marsipaster hirsutus, Sladen, 1882, Journ, Linn. Soc. Lond, (Zool.), vol. xvi. p. 205. 
Marginal contour substellate, interbrachial ares well indented, the minor radius being in 
the proportion of 60°2 per cent. R=13°5 mm.; r=8'°5 mm. Rays broad at the base, 
bounded by lines running direct from the median interradial line, with little if any 
curve or rounding. Abactinal area moderately convex; rays slightly upturned at the 
extremities. 
The supradorsal membrane is a fine, irregular, and somewhat spongiose tissue con- 
tinuous over the whole area, through which the extremities of the spinelets of the paxille 
protrude freely. No definite membrane, and no muscular fibrous bands are present. The 
paxillee have long robust pedicles and bear ten to fifteen fine, long, acicular spinelets ; the 
investing membrane of the crown is merged into the general supradorsal tissue, and the 
naked tips of the spinelets, which pass through the tissue, give the surface a some- 
what hirsute or prickly appearance. The spiracula are comparatively large, very few 
in number, and very widely spaced. ‘The oscular aperture is inconspicuous; the valves 
are formed of spines similar to those on the paxille generally, and present no special 
external characters. 
The adambulacral furrows are broad and straight, not petaloid. The tube-feet are 
arranged in simple pairs. ‘The armature of the adambulacral plates consists of five spine- 
lets, which form a transverse comb. ‘The two innermost spines are much smaller than 
the rest, and stand parallel to the furrow, rather in advance of, or aboral to, the other 
three, which are disposed across the broad adambulacral plate, are articulated on more 
or less definite tubercles, and form a series at a right angle to the furrow. The middle 
spine is longest. The whole series is webbed together with membrane which is deeply 
indented betiveen the radiating spimelets, but not nearly so much as in Marsipaster 
spinosissimus. 
The mouth-plates are broad, having wide lateral expansions, and with an elevated 
ridge along their line of junction, developing a prominent peak aborally and a rounded 
point inward. The armature consists of three long, robust mouth-spines, placed on the 
horizontal margin of each plate, the innermost spine being largest and longer than the 
spinelets of the adambulacral armature, the outermost less than half its size, and sometimes 
accompanied by an additional diminutive spinelet. The inner spines stand well away 
