10 CRUSTACEA MALACOSTRACA. IV. 



has only about three teeth. The abdomen is somewhat slender, a little shorter than the cephalothorax with 

 pseudorostrum. 



The antennulae, when stretched horizontally forwards, with the tip of the outer flagellum scarcely reach- 

 ing below the apex of pseudorostrum ; second joint of the peduncle is curved, thick, considerably thicker 

 than third joint; the outer 3-jointed flagellum is very considerably longer than third joint of the peduncle, 

 and its first joint is as long as its two distal joints combined; inner flagellum uncommonly long, even a little 

 longer than first joint of the outer flagellum. -- First pair of legs (fig. 2 b) without teeth on the lower side 

 of second joint; sixth joint scarcely longer than the fifth and much longer than the seventh. Second pair of 

 legs with the carpus in the adult conspicuously, in an immature specimen slightly, longer than the two distal 

 joints combined. Uropods (fig. 2 c) rather characteristic; the peduncle as long as the exopod, with about 

 4 spines on the inner margin; second joint of the exopod with 3 setae along the outer margin, the usual long 

 setae on the distal part of the inner margin and on the end, and besides 3 well developed setae on the upper 

 surface; endopod somewhat longer than the exopod; its first joint two and a half times as long as the second, 

 with 4 spines ( in an immature specimen with 6 spines) at the inner margin, and the spine at its end is rather 

 long and thick; second joint with two spines near the end, the second long and strong, and besides with an 

 extremely long terminal spine. 



Length of the female with marsupium 4.4 mm. 



Remarks. This small species is instantly recognized by the long pseudorostrum, the very few dorsal 

 saw-teeth on the carapace, two pairs of teeth on the frontal lobe, and the rami of the uropods. In the two 

 first-named features it shows relationsship to L. spiniventris n. sp., but the latter is much larger and differs 

 from L. tener in several sharply pronounced features. 



Occurrence. The "Ingolf" has gathered this species at three rather deep stations in the warm area. 



Davis Strait: Stat. 25: Lat. 633o' N., Long. 5425' W., 582 fath., temp. 3.3; i adult female. 



Denmark Strait: Stat. 97: Lat. 6528' N., Long. 2739' W., 450 fath., temp. 5.5; i immature female. 



South- West of Iceland: Stat. 78: Lat. 6o37'N., Long. 2752' W., 799 fath., temp. 4.5; i young 



specimen. 



6. Leucon longirostris G. O. Sars. 



11871. Leucon longirostris G. O. Sars, Kgl. Sv. Vet.-Akad. Handl. Ny Foljd. B. 9, No. 13, p. 42, Tafl. XV, 



%. 75- 



1879. Norman, Ann. Mag. Nat. Hist. 5 ser., Vol. Ill, p. 69. 



! 1906. Caiman, Mitth. Zool. Stat. Neapel B. 17, p. 414, PI. 27, figs, i 8. 



1913. Stebbing, Das Tierreich, 39. Lief., p. 70. 



Occurrence. Of this characteristic species I have not seen any specimen, but it has been recorded 

 by Norman (1. c.) from a deep-sea station at the entrance of Davis Strait: Lat. 59io' N., Long. 5025' W., 

 1750 fath. 



