84 CRUSTACEA MALACOSTRACA. II. 



and furnished with minute denticles along the lower margin; seventh joint strongly marked off from 

 the claw, with a distinct spinule at the end. Ventral tubercles on the five abdominal segments 



very low (fig. 4d). — Uropods as long as in the Sarsii-gr oup; the peduncle (fig. 4c), measured to the 

 insertion of the rami, slightly longer than the first joint of the endopod. thick and distally above pro- 

 duced in a large, oblong, subacute or acute process directed somewhat backwards and gradually curved 

 much upwards; endopod with its two joints subequal in length; the two-jointed exopod somewhat (in 

 L. dentifera) or considerably (in L. uncinata) shorter than first joint of the endopod. 



But the two species are separated by two features. In L. dentifera G. O. S. the carpus of the 

 cheliped is a little less than twice as long as deep, while in L, uncinata it is conspicuously deeper, 

 being only half as long again as deep (fig. 4b), the distal third being considerably expanded down- 

 wards. In L. dentifera the pleopods are very small, slightly longer than in L.tubcrculata (comp. fig. 3d), 

 in my specimen from Norway even less developed than according to Sars' fig. 2 pip, and each ramus 

 has a single seta less than half as long as the ramus and some tiny hairs; in L.uncinata the pleopods 

 (fig. 4d), though reduced in size, are much larger than in L. dentifera with a number of very conspi- 

 cuous sets and some among them as long as the rami. 



Length of the specimen 2.1 mm . 



Adult Male. Antennulae seven-jointed (fig. 41); the two proximal joints robust, together 

 considerably longer than the other joints combined, and second joint about two-thirds as long as the 

 first; seventh joint half as long again as the sixth; fourth, fifth and sixth joints each with a bundle 

 of sensory filaments from the lower end. Antennae with the articulation between fourth and fifth 



joint very distinct; fifth joint scarcely twice as long as the fourth, but only a little longer than 

 the sixth. 



Chelipeds somewhat robust (fig. 4f). Carpus about half as long again as deep, with the distal 

 third distinctly expanded downwards. Chela considerably longer than the carpus, twice as long as 

 broad, nearly triangular in aspect; distal anterior angle of the hand above the insertion of the finger 

 protruding but a little rounded; movable finger a little shorter than the anterior margin of the hand, 

 somewhat narrow, being scarcely half as broad as the fixed finger at the base, and its incisive margin 

 without serration; fixed finger with half of its incisive margin finely serrate. 



Second (fig. 4g) and third pairs of legs with the sixth joint only a little longer than the fifth 

 and about as long as seventh joint with claw. Posterior pairs (fig. 4I1) with seventh joint elongate, 

 slightly longer than the sixth and about half as long again as the claw. 



Sixth abdominal segment (fig. 41) posteriorly rounded. — Uropods with the peduncle as long 

 as second joint of the endopod, which is slightly shorter but much thinner than its first joint; the 

 two-jointed endopod somewhat more than half as long as first joint of the endopod. 



Length 1.5 mm . 



Remarks. It was after considerable hesitation that I established L.uncinata as a new species, 

 but the two differences pointed out between the females of A uncinata and L. dentifera seem to be 

 so important, that the deep-sea form ought to be established as a separate species. 



I think that the reference of the adult male to this species is quite certain. This male is so 

 small that it cannot belong- to L. armata or L. tuberculata taken at the same station. Furthermore 



