64 C. F. Liitken on Ophiurans. . 
Ophiura afinis (Liitken).—Liitken, p. 45, Tab. II, fig. 10. 
On the back of the disc a soni large scale and fifteen others, arranged i 
centric circles round it; betw all these are smaller scales. Radial shields chek 
broad, separated by a ca By of small ig Mouth-shields much as in O. Sarsit. 
Disc incisions with seven to nine papille on each side, which are strongest above. 
Behind. these are erg pepe a pee on the genital aioe gs. Upper 
-~ plates, t the base of arm, touching each other; farther out, longer and nar- 
ae thin arm-s rh the tied Jo ongest equa ‘i and as ns as side arm 
plate Only one tentacle- scale, Even the innermost under arm-plates separated 
Asgaar 
est youre ed of North Eur ORs J e and, as its name sugges ait te mo ce attacks wi 
Ophiocten than the other Ophiura: 
Ophiura squamosa einen p. 46, Tab. I, fig. 7. 
Be O. fasciculata [Forbes]? Sutherland’s Journal of pina &ec.) 
grin ae Pate toga above rounded, below more o Radia aca 
Incisions of disc bordered by a pe “ble TOW ner sto 
So yb a papi, Genital openings bordered ty grains. Mouth shielde 
Foe , as broad as, or broader than long. Side mouth-shields 
ual ‘re th. On each side of the innermost tentacle e-pores four 
or ve ire ren papill pig thin, wae fone 3 pper arm-plates broad 
ems e. The upper arm 
as long as a Joint, pars n large apesaabid from Greenland, often thickened and 
somewhat ; under itth-opite only about hal long. In specimens from 
Greenland iinotee of disc as great as 10™mm.; length of arms — mm.; jn those 
from as ——. disc 7m™m., arms 21™m., (Color; ~~ above dark gr. ay, b elow, ash 
gray; 8, green gray with darker bands. Sometimes the deel is reddish, or vi0- 
let, or spotted red and gray. Generally the radial shields make two bright marks, 
with a 34mm., have thin arms an upper arm-plates ve 
ter: nodosa (Liitken).—Liitken, p. 48, Tab. II, fig. 9. 
This species and O. Stuwitzii stand as a separate group under the genus Ophiura. 
They are characterized by the short, stout, knotted arms, numerous tentacle-scales, 
ve im: 
brach 
touching one another for some distance. Innermost tentacle-pores opening into the 
outer end of the mouth-slits. All the ‘teutaelageloes oie, a in the preceding 
species only the spa ae oa a s wap ee oe o five — scales, 
according to distance fro rasta to be like 
lize. Arms short, thick, pointed hentedy soos only twice as vor cae as diame ter 
of the disc. Upper arm-plates, near disc, hexagonal. Under arm-plates very 1a 
row, the innermost in contact wiih aaah om but the outermost eapeastee by the 
side arm-plates. The diamet of the disc reaches 8}mm., the length of 
the arms = Greenland, Newfo' iedtond: 
‘Ophiura Stuwitzii (Liitken).—Liitken, p. 49, Tab, I, fig. 8. 
wi ihe, Arms short, acute, conical. Upper surface of dis¢ 
scales, decreasing in size from centre to periphery ; under 
