CRUSTACEA MALACOSTRACA. II. 



2 9 



P. Lilljcborgii is thus more arctic than P. forcipatus ; at the very cold places in the northern East 

 Greenland it was found in quite low water, while in the open sea off Iceland it was most frequently 

 found in depths from about 200 to near 300 fan. 



17. Pseudotanais oculatus n. sp. 

 (PI. II, figs. 6a— 6d; PI. Ill, figs, ia— id.) 



Female (with the marsupium half developed, and younger specimens). Body four times as 

 long as broad. — Carapace, seen from above (fig. 1 a), with the lateral margins somewhat convex ex- 

 cepting near the front end, anteriorly half as broad as somewhat from the hind margin; the front 

 margin is considerably bent, forming an angle at the middle, and the anterolateral angle is produced, 

 but seen from the side (fig. 1 c) this produced part is not rounded but angular at the upper base of 

 the antennae. — The eyes are well developed, rather large, with about seven ocelli, and the cornea of 

 each ocellus very conspicuous; in recently captured specimens the eyes are black and in a couple of 

 specimens the dark colour has been preserved during many years. 



Antennulse about as long as the carapace plus second and half of the third thoracic segment, 

 somewhat slender. First joint, seen from the side (fig. 1 c), about four times as long as deep and with 

 the proximal part much deeper than the middle part; this joint is somewhat longer than the two 

 other joints combined, and third joint is somewhat longer than the second. — Antennae somewhat 

 robust; second and third joints proportionately long, without any real spine at the distal upper angle; 

 third joint a little less than half as long as the fourth, which is a little less than twice as long as 

 the penultimate joint. 



Chelipeds (figs. 1 b and 6 a) moderately slender. Carpus somewhat less than twice as long as 

 deep. Chela three times as long as broad (fig. 6a), with the posterior margin considerably concave; 

 fixed finger somewhat narrow near the base, yet considerably thicker than the movable finger, slightly 

 decreasing in breadth from near the base to somewhat beyond the middle and with most of the in- 

 cisive margin straight; movable finger somewhat shorter than the anterior margin of the hand, rather 

 narrow, towards the base not touching the other finger, and when the distal parts of the fingers are 

 crossed, a conspicuous interval is left between their more proximal parts, but especially at the base 

 this interval is a good deal narrower than in P. abyssi or P. forcipatus. 



Fifth thoracic segment a little shorter than the three preceding segments combined and as long 

 as the sixth. The thoracic legs of moderate length and thickness (fig. 1 b). Second pair (fig. 6 b) 



with the sixth joint elongate, even slightly longer than fifth and fourth joints combined, much taper- 

 ing towards the end and almost half as long again as seventh joint with claw. Third pair with the 

 sixth joint about as long as the fifth plus half of the fourth and not fully twice as long as seventh 

 joint with claw; the spur on fifth joint half as long as sixth joint, broad at the base but near the 

 base somewhat abruptly much thinner and then tapering to the acute end. Fourth pair (fig. 6 c) in 

 the main as the third, but fifth to seventh joint somewhat shorter and the short basal part of the 

 acute spur is very broad. Seventh pair (fig. 6d) with sixth joint slightly longer than the fifth and 

 twice as long as seventh with claw; the spur somewhat slender. 





