CRUSTACEA MALACOSTRACA. II. 8l 



The process from fifth ventral tubercle is still broader at the base and longer than in L. has tat a and 

 besides not horizontal but directed backwards and somewhat downwards. Pleopods and uropods about 

 as in L. hastata. 



Length of the female without marsupium 3.8 mm , of the subadult male 3.3""". 



Remarks. L. armata is so closely allied to L. hastata that I hesitated before establishing it 

 as a separate species. But it seems to be a good deal larger than /.. hastata and differs by having 

 the carpus of the chelipeds less robust and conspicuously less expanded downwards, furthermore by 

 the much more developed ventral abdominal tubercles and a different direction of the process from 

 fifth segment. And judging from the species belonging to the subdivions a and /? of the same group 

 a the shape of the carpus and the development of abdominal tubercles afford valuable specific cha- 

 racters. Finally L. armata was taken in very deep water with the temperatures above zero, while Z. 

 hastata was captured in considerable depths in the cold area. - The differences between both species 

 and the next form, L. Amdrufiii, are pointed out below. 



Occurrence. L. hastata has been taken by the "Ingolf" at two stations. 



Davis Strait : St. 36: Lat. 6i°5o' N., Long. 56°2i' W., 1435 fm., temp. 1.5 ; 1 spec.(°J. 



South-West of Cape Farewell: .St. 22: Lat. 58°io' N., Long. 48°25' W., 1845 fm., temp. 1.4 ; 1 spec. 



(subad. male). 



51. Leptognathia Amdrupii n. sp. 

 (PI. VIII, figs. 2a— 2 c.) 



Female. So closely allied to L. hastata and L. armata that it may be sufficient to mention 

 some features. — The autennulse (fig. 2a) are distinctly more slender than in those species, and the 

 first joint is slightly more than two and a half times as long as deep, but the relative length of their 

 joints shows no essential difference. — The chelipeds (fig. 2b) are a little less robust; the carpus is 

 about twice as long as the depth of its distal half which, in strong contradistinction to the other 

 species, is distinctly less deep than the proximal half and with the lower margin nearly straight; 

 chela a little longer than the carpus and more slender than in the two species mentioned, being consider- 

 ably more than twice as long as broad; the movable finger almost longer than the front margin of 

 the hand and as broad as the fixed finger. — Second pair of legs (fig. 2 c) without spinules on the 

 posterior margin of sixth joint. 



Four anterior abdominal segments with the ventral tubercles rather low; the process from 

 fifth segment about as long as in L. hastata but less horizontal, though scarcely directed as much 

 downwards as in L. armata. Pleopods and uropods in the main as in L. hastata; exopod of right 

 uropod two-jointed and distinctly more than half as long as first joint of the endopod, while the 

 exopod of left uropod is much shorter and one-jointed, as second joint has not been developed. 



Length of the female with marsupium 2.7 mm . 



Remarks. By the shape of the carpus of the chelipeds L. A mdrupii is easily distinguished 

 from the two preceding species. It differs on the whole a little more from L. hastata than from L. 

 armata, but while the last-named species is only known from stations with positive temperatures at 



Tlit Ingolf-Expedition. Ill- 5. II 



