REPORT ON THE ASTEROIDEA. 461 
covered spinelets, the innermost one of the series being sometimes out of line and more 
aboral in position than the rest. 
The mouth-plates are large, spade-shaped, and prominent actinally. Their armature 
consists of a marginal series of nine rather short skin-covered spinelets, which decrease 
in size gradually as they recede from the mouth. The spinelets are united for a short 
distance above their base by a membranous web, and their posture has a slight trend 
downward, which causes the mouth-plates to assume a scoop-like appearance. On the 
actinal surface of each plate are about four erect, tapering, skin-covered spinelets, usually 
in a closely placed lineal series, but sometimes subject to irregularity, those nearest the 
mouth being largest. The fan on the furrow margin of the adambulacral plate next the 
mouth-plate is usually semicircularly curved and more prominent than the others, appear- 
ing to form a kind of supplementary appendage to the mouth-plate armature, which adds 
greatly to the ornate character of the actinal aspect of this species. 
The actinal interradial areas are very small, and do not contain more than eight or 
ten small intermediate plates, probably fewer, and seven or eight of these bear small tufts 
of three or four short, tapering, skin-covered spinelets, the groups or tufts being widely 
spaced. 
The madreporiform body, which is oval in outline and rather small, is situated about 
midway between the centre of the disk and the margin. Its surface is convex and is 
marked with rather coarse striz. 
The ambulacral tube-feet are large, and have well-developed fleshy terminal disks. 
Colour in alcohol, a bleached ashy or yellowish white. 
Localities.—Station 303. Off the Chonos Archipelago, western coast of South Ame- 
rica. December 30, 1875. Lat. 45°31’ 0” S., long. 78° 9’ 0” W. Depth 1325 fathoms. 
Blue mud. Bottom temperature 36°°0 Fahr. ; surface temperature 54°°8 Fahr. 
Station 308. South of Wellington Island, west coast of Patagonia. January 5, 1876. 
Lat. 50° 8’ 30” S., long. 74° 41’ 0” W. Depth 175 fathoms. Blue mud. Surface 
temperature 51°°7 Fahr. 
Station 309. Off Puerto Bueno. January 8,1876. Lat. 50° 56’0”S., long. 74° 15’ 0” 
W. Depth 40 fathoms. Blue mud. Bottom temperature 47°°0 Fahr.; surface tempera- 
ture 50°°5 Fahr. 
Remarks.—This species is readily distinguished from Lophaster fureifer by the 
general form, by the structure of the abactinal paxille, and by the character of the 
armature of the adambulacral plates. 
