68 ASTEROIDEA. 
4, Off Achill Head, 500 fms, Royal Dublin Soc. 
j, k. Off West coast, Ireland, 250 fms. 
1, m. Off West coast, Ireland, 315 fms. 
n. Off West coast, Ireland, (?) fms. 
o. S.W. coast, Ireland, 1000 fms. 
p-t. Off South Sound, 20-25 fms. R. Trish Acad. 
u-x. Off the Skelligs, 90 fms. R. Irish Acad. 
y-b'. Blackrock Bay. R. Irish Acad. 
c'. Galway Bay, 15 fms. R. Dublin Soe. 
d'. 40 miles off Bolus Head, 115 fms. R. Dublin Soe. 
e'-g'. Kenmare River. 
h'-k', Newcastle, co. Down. Belfast Nat. Hist. Soc. 
V,m'. Portaferry, Strangford Lough. Belfast Nat. Hist. Soc. 
n’,o'. Coast of Ireland. Earl of Enniskillen. 
p,q. Off Liverpool. 
r'-t’. Plymouth. 
u',v'. Cullercoats, Nov. 1890. R. Howse, Esq. 
w'-z'. Montrose, July 16/18, 1890. W. Duncan, Esq. 
a,b”. Outer Haaf, Shetland, 80-100 fms. Rey. Canon Norman. 
2. Astropecten sphenoplax. (Plate XI.) 
Astropecten sphenoplax, Bell, Proc. R. Dubl. Soc. vii. (1892) p. 522, 
pl. xxiii. 
R nearly equal to 57; breadth of arm at base equal to diameter 
of disk. Marginal plates about 30, the lower sharply cut at their 
free edge so as to be wedge-shaped or to leave a gap between each 
plate. No spines on the superomarginals, or a few scattered spines, 
or prominent spines are pretty regularly developed from the angle 
to the middle of the arm, one on each plate, and more distally there 
are distinct spinous tubercles. The arms taper rather rapidly, and 
near the tip the whole of the dorsal surface is occupied by the 
superomarginals. The adambulacral plates are rather closely 
covered by fine spines arranged in two or more definite rows, or in 
two definite rows and the remainder more irregular. About ten 
spines at the sides of the inferomarginals, some of which are so 
long as to extend beyond the hinder edge of the plate next in front, 
and some of which are quite short. Madreporite quite close to a 
superomarginal. 
Colour, in spirit, straw to brown. 
Ris '52) Oo) 49)) a i leila 
a-e. 45 miles off Blackrock (N.N.W. of Achill 
Island), 500 fms. Royal Dublin Soe. 
Only known locality. 
3. PSILASTER. 
Psilaster, Sladen, Chall. Nar. i. (1885) p. 611; id. Chall. Rep. Ast. 
(1889) p. 221. 
An Astropectinine in which there is no marginal fringe; the 
