REPORT ON THE ASTEROIDEA. 9 
the young of this species. At any rate it is undoubtedly a Pararchaster, the only 
example from the locality, and from its size and character is unquestionably a juvenile form. 
Its measurements. are R=14 mm., r= 3'5-4 mm. There are twelve supero-marginal 
plates between the terminal and the median interradial plates, and the latter is very large. 
Four or five large spinelets are present in the central region of the disk, and there only 
appear to be single spinelets on the scale-like plates of the abactinal surface. There is 
one large spine on each marginal plate with usually a small thornlet on each side, and these 
are most definite on the inferior series. The adambulacral plates project with an acute 
angle into the furrow and there are not more than one or two spinelets of the furrow series, 
one being at the apex of the angle, and this is either the largest or the only one present. 
Near the mouth-plates are three spinelets in a few cases. On the actinal surface of the 
adambulacral plate there is one robust spinelet throughout, and this on the inner part 
of the ray is frequently accompanied by a second, which stands obliquely behind it. 
There are no actinal intermediate plates, and the odd interradial infero-marginal plate is 
very large, and might almost be mistaken at first sight for a single large intermediate or 
ventral plate; on its surface are several thornlets. The tube-feet have well-developed, 
proportionally large, button-like knobs at their extremity, The madreporiform body is 
rather nearer the margin than midway between that and the centre, and there are very 
few striation grooves upon it. 
Localities. —Station 147. West of the Crozet Islands. December 30, 1873. Lat. 
46° 16’ 0” S., long. 48° 27’ 0” E. Depth 1600 fathoms. Diatom ooze. Bottom tempera- 
ture 34°°2 Fahr. ; surface temperature 41°:0 Fahr. 
Station 143. Off the Agulhas Bank, south of the Cape of Good Hope. December 
19, 1873. Lat. 36° 48’ 0” S., long. 19° 24’ 0” E. Depth 1900 fathoms. Globigerina 
ooze. Bottom temperature 35°°6 Fahr. ; surface temperature 73°:0 Fahr. 
Remarks.—This species may be recognised unmistakably by the presence of the large 
comb-formed pedicellaris between the infero-marginal plates, and is otherwise a well- 
marked form. 
5. Pararchaster armatus, vu. sp. (Pl. L- figs. 5 and 6; Pl. IV. figs. 5 and 6). 
Rays five. R= 37mm; 7=6mm. R>67. Breadth of a ray between the second 
and third supero-marginal plates, 4 mm. 
Rays elongate, narrow and attenuate outwardly, tapering from the base to the 
extremity ; subdepressed, with low vertical walls, and consequently nearly rectangular 
in section. Disk small. Abactinal surface flat and level. Actinal surface very slightly 
‘ prominent at the mouth-angles. Interbrachial arcs wide and well-rounded. 
The abactinal surface of the disk and rays is covered with a plating of small, thin, 
subcircular spicules, overlaid with a delicate membranous tissue. The spicules bear 
