CRUSTACEA MALACOSTRACA. II. 99 



of the three preceding segments. Uropods (fig. 6h) a little longer than sixth segment, somewhat 

 robust; peduncle thick, only a little longer than deep; endopod with first joint a little longer than the 

 second and considerably longer than the exopod. 



The animals are whitish or light yellowish and less shining than in L.polita. 



Length of females with marsupium 2.7 3 mm ., of a very large female without marsupium 3.3 mm . 



Subadult Male. The antennulae (fig. 6i) are considerably thicker than in the female; first 

 joint only slightly longer than second and third joints combined, about twice as long as deep; second 

 joint only a little less deep than the proximal part of the first joint and conspicuously less than half 

 as long again as deep. Abdomen longer than in the female, slightly longer than the three preceding 

 segments combined. Pleopods larger and especially the exopods conspicuously longer with longer 

 setae than in the females. Length 2.4 3.0 mm . 



Remarks. L. mcina is allied only to L.polita; the best distinguishing characters between 

 them are afforded by the joints of the chelipeds and by the much feebler armature of the incisive 

 margins of the fingers of the chelae in L. mcina. 



The mouth-parts have been examined. The mandibles (fig. 6c) are slender and their molar 

 processes are very different from those in the species of Leptognathia figured by Sars. Each molar 

 process has the proximal half somewhat thicker than the distal; the end is rounded with three 

 triangular teeth in front (fig. 6d) and posteriorly with several slender processes forming a comb. 

 The maxillulae (fig. 6e) are very slender, but the major part of the palp is somewhat inflated. 



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



Davis Strait: 81.32: Lat. 66 35' N., Long. 56 38' W., 318 fm., temp. 3.9; i spec. 

 St. 28: Lat. 65 14' N., Long. 55 42' W., 420 fm., temp. 3.5; 40 spec 



Besides it has been taken by Admiral C. Wandel in 1889 at the following place. 



Davis Strait: Lat. 66 49' N., Long. 56 28' W., 235 fm., sand and ooze, temp. 4.4; i spec. 



Group d. Uropods with the peduncle produced in a triangular protuberance probably answering 

 to an exopod not marked off, endopod two-or one-jointed. Pleopods moderately well developed. 



Species 63 65. 



This group is a very natural one, as its three species are allied to each other and differ in 

 several features from all species of this genus described in the preceding pages. The chelipeds differ 

 from those of all other species by the curiously shaped ischium and carpus; furthermore the basal 

 joint has the whole oblique posterior margin attached to the cephalothorax. The three posterior pairs 

 of legs are robust with seventh joint short and the claw very short. 



63. Leptognathia profunda n. sp. 

 (P1.X, figs, i a i h). 



Female (without marsupium). Body slender, a little more than eight times as long as broad 

 (fig. i a) and with the abdomen almost broader than the thorax or the carapace. Carapace as long as 

 the two following segments combined (fig. i a), seen from above considerably longer than broad, feebly 

 angular before the middle and in front more than half as broad as near the middle. 



13* 



