REPORT ON THE ASTEROIDEA. ig 
conspicuous and decided in the variety. The madreporiform body has not the slightly 
convex character noticed in the type, and less convolution is present in the striations, 
which have a more or less regular appearance of centrifugal radiation. The tube-feet 
have a smaller terminal knob. 
Locality —Station 44 or 45. Off the coast of North America, east of Delaware and 
Maryland. 
Station 44. May 2, 1873. Lat. 37° 25’ 0” N., long. 71° 40’ 0” W. Depth 1700 
fathoms. Blue mud. Bottom temperature 36°:2 Fahr.; surface temperature 56°°5 Fahr. 
Station 45. May 3, 1873. Lat. 38° 34’ 0” N., long. 72° 10’ 0” W. Depth 1240 
fathoms. Blue mud. Bottom temperature 37°°2 Fahr.; surface temperature 49°5 Fahr. 
2. Pararchaster antarcticus, u. sp. 
This species is very closely allied to the preceding one, and it is not without some 
hesitation that I have ventured to place it as distinct, for unfortunately only two 
examples were obtained, one much broken and imperfect, the other immature. The 
former of these is consequently the only one available for comparison with the preceding 
species, and this it resembles so much in general character that I have not considered it 
necessary to give drawings of the mutilated specimen. 
The form is smaller than Pararchaster semisquamatus, its minor radius measuring 
11°5 mm, (All the rays are imperfect, and from what remains they appear to have been 
probably shorter and more tapering than in that species.) The abactinal area of the disk 
is slightly inflated and convex, instead of flat, and the general character of its spinulation 
accords much more closely with that of Pararchaster semisquamatus, var. occidentalis, than 
with the type-form of that species. ‘The large spines upon the disk are confined entirely 
to the central area, and not many more than those on the basal, radial, under-basal, and 
dorso-central plates are present. The single central spinelet on the abactinal plates along 
the ray is short, robust, and subconical, and the plates appear comparatively larger in 
proportion to the size of the animal than in Pararchaster semisquamatus. The lateral 
walls at the summit of the interbrachial are are vertical, and do not bend over to form a 
bevel on the abactinal surface. The lateral walls generally along the ray are low, giving 
the ray a very flat appearance. The supero-marginal plates beyond the sixth (from the 
odd median interradial plate) bear two spines side by side, which may be either equal or 
one less than the other; and even in those plates where this second spine is not present 
in the form of a definite large spine, it is represented by a small mihary spinelet, and of 
these there may also be one or more additional on the plates which bear the two large 
marginal spines. On the actinal surface of the adambulacral plates three large spines 
are not unfrequently present. On the surface of the infero-marginal plates, and parallel 
to the upper adoral sloping margin, is a lineal series of three to five small thorn-like 
denticles or spinelets, which, although sometimes less conspicuously marked, are still a 
