SEA LILIES, STARFISHES, ETC.—CLARK. 61 
Genus Ecurnaster, Miiller and Troschel. 
ECHINASTER ACANTHODES,! sp. nov. 
(Plate xix., fig. 1-2; Fig. 7.) 
R=70 mm.; r=12 mm.; R=6r. Br=14 mm.; R=5 
br. Br at middle of ray=9 mm.; at tip, 3.5 mm. Disk 
moderate, slightly arched ; arms terete, tapering very uni- 
formly to the narrow but blunt tip. Abactinal skeleton 
coarse and rather heavy ; each plate bears a large sharp spine, 
.5-1 mm. high. Papule confined to abactinal surface ; the 
areas in six irregular longitudinal series, each area with few 
(2-6) papule. Adambulacral armature consisting of 3 spines 
in a vertical series, the smallest high up in ambulacral furrow, 
the second, little larger, just below, and the third, much 
larger, on the furrow-margin; except on the 12-16 plates 
nearest the mouth, there occurs on the actinal surface of 
every other plate, a conspicuous subambulacral spine, equal 
to, or larger than, that on the furrow-margin ; back of this. 
Fig. 7.x3. 
spine, on the actinolateral or more likely the inferomarginal 
plate, is another still larger spine, about 2 mm. high. Oral 
plates with no surface spines and marginal spines united by 
membrane, which reaches more or less nearly to their tips, 
and extends outwards along the rays uniting more or less 
evidently the furrow-margin spines of the first few adam- 
bulacral plates. Beyond the disk, each spine is more or less 
clothed in membrane. Madreporite very small, about half- 
way between disk-centre and margin. Colour (dry), light 
brown. Three specimens. 
The general appearance of this species is more like that of 
the West Indian Echinasters than like that of its East Indian 
congeners. The conspicuous spines and the total lack of 
1. dxavOwWéns=tull of thorns; in reference to the spiny surface. 
