38 
suboral spines (one on each side) are three-edged and hollowed on 
the sides (Fig. 1), as in Pt. trigonodon Fisher. «AGARONSSER mem- 
brane only slightly developed. Pseudopaxillæ with low [ 
stalk, carrying 3 long, slender spines. Those round 
the anal opening larger. The supradorsal membrane 
is thin, without distinct reticulation; no spicules. 
Spiracula few, singly placed.  Papulæ simple. The 
madreporite is knob-shaped, close to the anal opening. 
Tubefeet in two rows. Disk only. slightly arched. 
In general appearance it resembles Pt. militaris, 
from which it is, howeyer,: very. well distinguished, 
as it is, indeed, from all species of this genus hitherto . 
described: — Though found in a Greenland fjord, it is 
evidently no aretic species, but belongs to the fauna 
of; the warm. area of the; Northern Atlantic, as ap- 
peaårs from the fact that it was found together with 
such forms as Lætmogone violacea, Amphiura' denti- 
culata a. 0. — That it will prove to have a similar bg 4 Sellers 
wide distribution as these forms can scarcely be sfer KL se 
doubted. ; 
2. Deklasona tjalfiana n. sp. 
One specimen taken at 64? 05' N. 55? 20' W, 1100 M. by the 
«Tjalfe”-Expedition ($/5 1909). 
Diameter of disk 6 mm, length of arms ca. 15 mm. Disk flat, 
covered with comparatively large scales, among which the central 
plate and a circle of 7 scales surrounding it are especially con- 
spicuous. Radial shields comparatively small, with their outer .ends 
in contact or just separated by some small scales. Some small 
irregular scales separate the first dorsal arm-plate from .the radial 
shields. The proximal dorsal arm plates are broadly in contact; 
from the 6th they are separated, the distance becoming gradually 
larger farther out on the arm; they are triangular, with the outer 
side rounded and tbickened, End somewhat prominent, as 
seen in side view. 
