110 OPHIUROIDEA. 
Oph. (1882) p. 77; Felstrup, Zool. Dan. Pigh. (1890) p. 24, 
pl. ii. fig. 4. 
A rather small species with somewhat delicate arms. Covering- 
scales of disk imbricated, coarse, irregular in shape. Radial shields 
small, inconspicuous, very irregular and inconstant in shape. Six 
teeth ; mouth-papille not numerous—three or four rather wide 
ones in each jaw-plate. Mouth-plate short, cordiform ; mouth- 
plates band-like. Bursal slits well-marked. Notches in disk not 
very deep; arm-comb formed by a few quite short spines. Arms 
flat, upper plates large at base and regularly hexagonal, proximal 
sides diminish more distally; side arm-plates meet below, but 
lower arm-plates longer than in O. ciliaris; arm-spines usually 
three, the uppermost the longest but it is quite short. A single 
tentacle-scale. 
Colour when dried white, or banded, spotted, or mottled with 
grey, brown, or red. 
Fee allo. 
r= 45; 3. 
Distribution. North Sea, North Atlantic (east and west); Arctic 
Ocean. 
5. Ophiura signata. 
Ophioglypha signata, Verrill, Amer. Journ. Sei. § ‘Arts, xxiii. 
(1882) p. 220; Lyman, Proce. Roy. Soc. Ed. xi. (1885) p. 707 ; 
Foyle, op. cit. xii. (1884) p. 715, pl. vii. figs. 4-8. 
Ophioglypha aftinis, Verrzdl, non Liuthen. 
This species, which I have not seen, is thus described by Prof. 
Verrill :-— 
“Disk varied in colour, rounded pentagonal, flattened above, or 
even concave when dried ; covered with scales which form a distinct 
rosette ; the dorsal surface is separated from the ventral by a mar- 
ginal ridge, which becomes well-marked in dry specimens ; notches, 
at the bases of the arms, slight, with an irregular and interrupted 
series of minute spinules; usually a short row of smail, slender 
spinules on each side of the notch, and a small, irregular, isolated 
croup in the middle, sometimes nearly obsolete, or represented by 
only one or two small spinules in the larger specimens; just below 
these there is a similar small group on the middle of the first visible 
arm-plate; the second arm-plate sometimes bears, also, two or more 
small spinules, but these never form a regular row. JDisk-scales, 
when living, obscured more or less by a thin skin; the central scale 
and two alternating circles of five each, surrounding it, at a little 
distance, are round, dark-coloured, and distinctly larger than those 
that intervene, which are small but distinct, and often form rather 
regular circles around the larger scales ; in the interbrachial spaces, 
near the edges, there are also larger scales; radial shields irregular, 
long-triangular, their edges more or less covered by small scales, and 
separated by a rather wide wedge of small scales, in several rows, 
