CRUSTACEA MALACOSTRACA. II. 



97 



joint with the upper margin half as long as that of second joint and conspicuously longer than the 

 depth of the joint; fourth joint considerably shorter than the second and its longest terminal seta 

 longer than the two distal joints combined. — Antennae only a little shorter than the antennulae, with 

 fourth and fifth joints well separated. 



Chelipeds (figs. 5b and 5c) strong and very curious. Basal joint nearly deeper than long; the 

 posterior protuberance is, seen from the side, small, about as long as deep and with only the lower 

 margin free, while even the posterior end is situated somewhat before the middle of the cephalothorax; 

 the area between the hind margin of the basal joint and the thinner integument behind the cephalo- 

 thorax is large, oblong, more than twice as long as deep and well separated by a thin-skinned, hori- 

 zontal ridge from the carapace. The carpus, though a good deal longer than the basal joint with posterior 

 protuberance, is short and deep, being less than half as long again as deep, with the upper margin 

 very convex and the lower peculiarly hollowed. Chela somewhat longer than carpus and twice as 

 long as broad; anterior margin of the hand distinctly shorter than the movable finger, which is very 

 thick towards the base (fig. 5 c) with its incisive margin very sinuate, having a broad, oblong-triangular 

 protuberance before the middle; fixed finger with two tubercles on the incisive margin, the proximal 

 being somewhat small though very distinct, the distal large, much broader than high, rounded; two 

 setae on the posterior margin of the hand, and the end of both fingers obtuse. 



Second thoracic segment somewhat shorter than the third (fig. 5 a); all segments transverse 

 and all, excepting the seventh, subquadrangular with the angles rounded. - Thoracic legs uncom- 

 monly short. Second (fig. 5d) and third pairs moderately slender; distal spines on fourth and fifth 

 joints moderately long; sixth joint somewhat longer than the fifth and a little longer than seventh 

 with claw; the claw a little more than half as long as seventh joint. 



Abdomen somewhat shorter than the three preceding segments combined (fig. 5 a). Five anterior 

 segments each with a rounded, moderately large ventral protuberance; pleopods moderately small and 

 their rami with somewhat long setae (fig. 51). Sixth segment about as long as the three preceding 

 segments combined. -- Uropods a little shorter than their segment, somewhat robust; peduncle longer 

 than deep; first joint of the endopod a little longer than the second and somewhat longer than the 

 one-jointed exopod. 



The body of the animal is polished, shining, yellowish, and the fingers of the chelae are deep 

 reddish yellow. 



Length of the single probably full-grown specimen 3.2 mm . 



Remarks. This species is moderately large and easily distinguished from all other forms of 

 the genus excepting L. vicina n. sp. by its shape, colour, uropods, etc., but especially by the peculiar 

 development of the chelipeds, which originate before the middle of the cephalothorax. The differences 

 between L. polita and L. vicina are pointed out in the 'Remarks" on the latter species. 



Occurrence. This species has been taken by the "Ingolf" at a single station. 

 North of the Faeroes: St. 141: Lat. 63°22'N., Long. 6° 58' W., 679 fm.. temp. -=- o.6°; 1 probably 

 full-grown specimen and 1 juvenile specimen without seventh pair of legs. 



Thelngolf-Expedition. III. ;. I3 



