﻿CRUSTACEA MALACDSTRACA. II. yg 



foiirtli joint distinctly lono;er tlian fifth joint; distal spines on fifth joint unconinionh- lon<j; sixth joint 

 not fnll\' half as long again as the fifth; scxcntli joint with claw scarceh- longer than fifth joint. 

 Three posterior pairs (fig. d) with sixth joint almost as lung as se\-enth with claw; setiforni denticles 

 on seventh joint nearU- inconspicuous; claw proportionatel\' long. 



Five anterior abdominal segments with the median ventral tnhcrcles peculiarlv sliaped (fig. 6e), 

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

 convex. Pleopods with their marginal seta' about three times as long as the ranu'. — 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 slighth- 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. L. alba is easily distinguished from all above-described species l)y the shape of 

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

 The species is uucommonh' robust. 



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



South-West of Cape Farewell: St. 22: Lat. 58^ 10' N., Long. 48^25' \V., 1845 fiu., temp. 1.4'; i spec. 



Group a, subdi\-ision ;• (\-id. p. 66). 



49. Leptognathia hastata n. sp. 

 (PI. VII. fig.s. 7a— 7g.| 



Female (witliout luarsupium). Antennuke 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 considerabh tapering; second joint thick and long, a little luore 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 somewliat shorter than tlie second. — .\ntenn;u 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 e\'en less than, half as long again as 

 deep, with the distal part strongh- expanded downwards and the corresponding lower margin \-ery 

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

 with the distal anterior corner subrectangular and ]irotruding; mowablc 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. vSecond and third pairs subequal (fig. 7c'; jiosterior distal 

 spine on fourth joint a little 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; sc\enth joint with claw 

 slightly longer than fifth joint. 'Phree posterior jxiirs (fig. 7(1) have seventh joint considerably shorter 

 than the sixth and the row of setiforni denticles is ver\ cons]Mcnous (fig. 70, the denticles being coii- 

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



