CRUSTACEA MALACOSTRACA. II. 87 



thoracic segment. From L. suba-qualis it differs in the shape of the body, which in the latter species 

 is extremely slender with the lateral margins nearly parallel; furthermore the exopod of the uropods 

 is proportionately conspicuously longer in L. subcequalis than in L. manca. L. manca is rather remote 

 from the other forms of group c. 



Occurrence. The "Ingolf" has taken this species at two localities. 



Davis Strait: 81.25: Lat 63 30' N., Long. 54 25' W., 582 fm., temp. 3.3; 23 spec. 



South of East-Iceland: St. 90: L,at. 63 43' N., Long. 14 34' W., 90 fm., temp. 7.0; i spec. 



Distribution. Sars had this species from two widely separated places on the Norwegian 

 coast, at depths of 100 150 fathoms. It has scarcely been mentioned by any other author. 



55. Leptognathia subaequalis n. sp. 

 (PI. VIII, figs. 6a-6f.) 



Female. Body extremely slender (fig. 6a), nine or ten times as long as broad, seen from above 

 nearly cylindrical, with fourth and fifth thoracic segments slightly broader than the carapace or the 

 abdomen; the lateral margins of each thoracic segment nearly parallel, not angular but a little or con- 

 spicuously rounded at both ends of each segment. Carapace, seen from above, about half as long 

 again as broad, twice or more than twice as long as second thoracic segment but somewhat shorter 

 than the two anterior segments combined; the front end of the carapace conspicuously more than half 

 as broad as the carapace somewhat behind the middle; rostral process somewhat narrow. 



Antennulse almost as long as the carapace (fig. 6b), somewhat robust. First joint nearly as 

 long as the three other joints combined, a little or somewhat more than twice as long as deep and 

 with the proximal third considerably thickened downwards; second joint much produced above, with 

 the upper margin distinctly more than half as long as first joint and twice as long as the depth of 

 the joint itself; third joint with the upper margin very short; fourth joint conspicuously shorter than 

 the second, much shorter than some of the terminal setse. Antennae with fourth and fifth joints 



completely fused, without any vestige of an articulation. 



Chelipeds (fig. 6b and 6c) moderately strong. Basal joint long, nearly as long as the carpus, 

 with the rounded posterior process reaching near to the front lower angle of second thoracic segment. 

 Carpus distinctly less than twice as long as deep, with its lower margin moderately arcuate. Chela 

 slightly or a little longer than the carpus, somewhat more than twice as long as broad; anterior 

 distal corner of the hand not protruding, obtuse; movable finger considerably shorter than the anterior 

 margin of the hand and much narrower than the fixed finger, which has distinct, sharp teeth on the 

 distal half of the inner margin. 



Second (fig. 6b) and third pairs of thoracic legs moderately strong; posterior spine on fourth 

 joint and both distal spines on fifth joint long; fifth joint only as long as the fourth; sixth joint more 

 than half as long again as fifth joint, but a little shorter than seventh joint with claw. Three 

 posterior pairs of legs somewhat slender; sixth joint at least somewhat shorter than seventh joint 

 with claw, and the claw as long as or shorter than seventh joint 



Abdomen cylindrical, as long as the sum of the two posterior thoracic segments. The lower 



