I _• CRUSTACEA MALACOSTRACA. IV. 



Remarks. L. spiniventris is more allied to L. longirostris G. O. S. than to any other northern species, 

 but it differs in several features. The dorsal edge has only 2 teeth, while L. longirostris has about 7 ; the pseudo- 

 rostrum is proportionately somewhat shorter; the antennal notch without teeth; the last thoracic segment 

 with two pairs of ventral processes, while only one pair are found in L. longirostris; first abdominal segment 

 has a pair of ventral processes not found in any other species, finally the endopod of the uropods has its 

 second joint very short, proportionately a good deal shorter than in L. longirostris. 



Occurrence. Not taken by the "Ingolf", but by Dr. Joh. Schmidt in the middle of July 1903 at 

 a single place. 



South of Iceland: Lat. 62 57' N., Long. 19 5N' \Y., 508 fath. 2 specimens. 



8. Leucon profundus n. sp. 



(PI. I. figs. 4a— 4d). 



Female (with marsupium). Carapace rather oblong, without pseudorostrum a little less than 

 half as long again as deep, and slightly shorter than the free segments combined; when the pseudorostrum is 

 included the carapace is a little less than twice as long as deep. The serration on the dorsal edge is well devel- 

 oped excepting a moderately short interruption somewhat before the posterior end. The frontal lobe has on 

 each side a good-sized tooth a little above its lower margin. Pseudorostrum rather long, a little less than 

 one-third as long as the carapace without pseudorostrum, somewhat upturned, half as long again as deep; 

 the upper margin is slightly concave, the lower and the terminal margins constitute together a continuous 

 rather convex line, and the terminal margin has about 6 somewhat small teeth. The antennal notch is sub- 

 angular at the bottom and rather deep, as the antero-lateral corner of the carapace is considerably produced 

 with its upper margin finely serrated; the lower margin of the carapace has only about 7 teeth. The abdomen 

 is moderately robust about as in L. Nasiea Kr., and somewhat longer than carapace with pseudorostrum. 



The antennulae when stretched forwards (fig. 4b) with the peduncle long, reaching far beyond the 

 end of pseudorostrum. Second joint of the peduncle is unusually slender, third joint longer than second and 

 still considerably more slender; outer flagellum only half as long as third peduncular joint, with its first joint 

 longer than the two other joints combined; inner flagellum very short. Third maxillipeds normal; fourth 

 joint with 2 teeth, both on the distal part of its outer side, while the fifth joint has only a single tooth, situated 

 distally on the outer margin. First pair of legs (fig. 4c) moderately robust; second joint on the distal half 

 of the lower margin with a row of strong teeth; third joint with a tooth on the inner, and fourth joint with a 

 tooth on the outer margin near the end; fifth joint conspicuously longer than the sixth, which is not fully 

 twice as long as the seventh. Second pair of legs with the carpus rather long, somewhat longer than the pro- 

 podus and dactylus combined. -- I'ropods moderately slender (fig. 4d) ; the peduncle a little longer than 

 the exopod, with about 3 long and 2 short spines along the distal half of the inner margin; second joint of 

 the exopod with a few short setae along the outer margin, no setae on the upper side, while the end and the 

 distal part of the inner margin have the usual long setae; endopod very considerably longer than the exopod, 

 its first joint about two and a half times as long as second joint and slightly shorter than the exopod. with 



