CRUSTACEA MALACOSTRACA. II. 



79 



fourth joint distincth' longer than fiftli joint; distal spines on fifth joint uncommonly long; sixth joint 

 not fully half as long again as the fifth; seventh joint with claw scarcely longer than fifth joint. 

 Three posterior pairs (fig. d) with sixth joint almost as long as seventh with claw; setiform denticles 

 on seventh joint nearly inconspicuous; claw proportionately long. 



Five anterior abdominal segments with the median ventral tubercles peculiarly shaped (fig. 6e), 

 as each tubercle, seen from the side, is somewhat low, because its lower margin is concave instead of 

 convex. Pleopods with their marginal setae about three times as long as the rami. — Uropods a 

 little longer than the two posterior segments combined; peduncle about half as long again as deep, 

 only half as long as the first joint of the endopod; second joint of the endopod slightly longer than 

 the first; exopod about half as long as the proximal joint of the endopod. 



The specimen is 3.7""" long; it is quite white. 



Remarks. /,. alba is easily distinguished from all above-described .species by the .shape of 

 the ventral abdominal tubercles; the shape of the joints of the chelipeds also affords good characters. 

 The species is uncommonly robust. 



Occurrence. Taken by the "Ingolf at a single station. 



South-West of Cape Farewell: St. 22: Lat. 58" 10' N., Ivong. 48° 25' W., 1845 fm., temp. 1.4°; i spec. 



Group a, subdivision ;■ (vid. p. 66). 



49. Leptognathia hastata u. sp. 

 (PI. VII. figs. 7a-7g.) 



Female (without marsupium). Antennulse somewhat or a little shorter than the carapace. 

 First joint (fig. 7 a) a little shorter than the three other joints combined, somewhat more than twice 

 as long as deep and considerably tapering; second joint thick and long, a little more than half as 

 long as the first and somewhat produced above; upper margin of third joint a little less than half as 

 long as that of the second; fourth joint somewhat shorter than the second. — Antennae with fifth 

 joint slightly more than half as long again as the fourth, which is as long as the sixth. 



Chelipeds (fig. 7 b) rather robust. Carpus only about, or even less than, half as long again as 

 deep, with the distal part strongly expanded downwards and the corresponding lower margin very 

 convex. Chela a little longer than the carpus, about twice as long as broad, without serration; hand 

 with the distal anterior corner subrectangular and protruding; movable finger somewhat broad, a 

 little shorter than the anterior margin of the hand; fixed finger with the usual teeth on the inci- 

 sive margin. 



Thoracic legs moderateh' strong. Second and third pairs subequal (fig. 7c); posterior distal 

 spine on fourth joint a Httle longer than the fifth joint; .sixth joint about half as long again as the 

 fifth and its lower margin with a more or less distinct row of small denticles; seventh joint with claw 

 slightly longer than fifth joint. Three posterior pairs (fig. 7d) have seventh joint considerably shorter 

 than the sixth and the row of setiform denticles is very conspicuous (fig. 7 e), the denticles being con- 

 spicuously longer than in the preceding forms; claw somewhat more than half as long as seventh joint. 



