94 ASTEROIDEA, 
2. Pteraster personatus. 
Pteraster personatus, Sladen, Proc. R. Irish Acad. i. (1891) p. 694, 
pl. xxviii. 
R=70; r=25 millim. 
This species is stated to have the facies of Hymenaster and to be 
intermediate in many respects. between Pteraster and Hymenaster. 
The comb of adambulacral spines forms a regular semicircular 
curve and is curved round aboraliy at the margin of the furrow. 
There are no secondary or superficial spines on the actinal surface 
of the mouth-plates. 
Found at ol? 1 NG tio 500 W.26 750"tme: 
2. HYMENASTER. 
Hymenaster, Wyv. Thoms. Depths of the Sea, (1873) p. 120; Dan. & 
Kor. Norske Nordh, Ast. (1884) p.79; Sladen, Chall. Rep, Ast. (1889) 
p. 470. 
A Pterasterid in which there are no transverse adambulacral 
combs of spines and no web; the marsupial cavity is spacious. 
The well-developed supradorsal membrane contains muscular fibres. 
Spiracula present. Spinelets of paxille short, and not protruding 
through the membrane. 
1. Hymenaster pellucidus. 
Tymenaster pellucidus, Wyv. Thoms. Depths of the Sea, (1873) p. 120, 
fig. 16; Dan. §& Kor. Nyt Mag. 1877, p. 68, pl. iv. figs. 1-14; 
tid. Norske Nordhavs Ast. (1884) p. 72, pl. xii. figs. 1-17, pl. xv. 
figs. 7 & 8; Slad. Chall. Rep. Ast. (1889) p. 508. 
R— er 
Abactinal surface arching towards the centre, actinal surface flat. 
Five large paxille round the funnel-shaped aperture of the marsu- 
pium, each of which carries six to eight short and eight to ten long 
calcareous needles; the remaining paxille have four long and 
three short needles. Hach adambulacral plate has three spines, two 
of which face inwards, while the third faces the semilunar aperture 
on the lateral margin of the ray. Madreporite circular. 
Colour very red ; integument translucent. 
Distribution. Eastern side of North Atlantic as far as Jan Mayen 
and Spitsbergen. 70 to 1539 fms, 
a. Faeroe Channel, 580 fms. * Porcupine ’ Exp. (St. 59), 
Specimens from 12 to 80 millim. in diameter have been examined 
by Messrs. Koren and Daniclssen, from whose diagnosis that just 
given has been drawn up. 
