﻿J24. - CRUSTACEA MALACOSTRACA. II. 



The antennulEe (fig. 3k) are considerably thicker; the first joint somewhat or rather considerably 

 shorter than the three other joints combined and onh- a little more than two and a half times as 

 long as deep; second joint con.siderably produced above; fourth joint nearly as long as the second 

 and thickened, especially at the base. The five anterior abdominal segments (fig. 3 m) are much longer 

 than in the female, together about twice as long as seventh thoracic segment. The pleopods are 

 somewhat large, with the rami much longer than the peduncle, but the terminal setce are slightly 

 more than half as long as the rami and somewhat thick. 



vSmaller than the female.s, measuring only 2.2 — 2.3""". 



Remarks. P.ii/sio//is is a fine form which is abundantly distinguished from tlie two following 

 species by possessing ventral thoracic processes, b\- the shape of the thoracic segments, the chelipeds 

 and above all by the uropods. 



Occurrence. It has been taken b\ the "Ingolf" at three stations. 



Davis .Strait: vSt. 32: Lat. 66°35' N., Jvong. 56°38'W., 318 fm., temp. 3.9^; 1 spec. 



— — .St. 25: Lat. 63°3o' N., Long. 54° 25' W., 582 fm., temp. 3.3°; more than a hundred 



specimens. 



— — .St. 24: Lat. 63°o6'N., Long. 56° 00' W., 1199 fm., temp. 2.4"^; 6 spec. 



77. Paranarthrura subtilis n. sp. 

 (PI. Xn, figs. 4a-4d.) 



Female (without niaisupiuui). Ratlier slender (fig. 4a), about seven and a half times as long 

 as broad a little behind the front end of second thoracic segment and tapering considerably backwards. 

 — Carapace as long as the second and half of the third segment combined — these segments are 

 long — , somewhat longer than broad, not full\- twice as broad at the middle as at tlie front end and 

 with the lateral margins raoderateh' convex. 



Antennulse much shorter than the carapace (fig. 4 b), somewhat thick. First joint subcylindrical 

 and somewhat more than twice as long as deep; second joint scarcely produced above and half as 

 long as the first; third joint a little longer than deep; fourth joint scarceh' as long as the second. — 

 Antenna; short, a little more than half as long as the antennula:'. 



Chelipeds (fig. 4 b) somewhat .slender. Basal joint short, about as long as deep, without posterior 

 protuberance, but attached b\- the whole oblique hind margin, which is situated a little behind the 

 middle of the cephalothorax. Carpus two and a half times as long as deep, with the upper proximal 

 part i^roduced backwards, the major part of the ujiper margin nearly straight and the lower margin 

 a little sinuate. Chela scarcely as long as the carpus, somewhat slender, being two and a half times 

 as long as broad; the movable finger as long as the front margin of the iiand, nioderatelv roljust; 

 the posterior margin is a little concave at the middle, where a single seta is inserted; the end of both 

 fingers very acute. 



Thoracic segments (fig. 4a) with the lateral margins ver\- conspicuously angular; the angles, 

 which on second segment are near the front end, are on the following segments placed gradually 

 more backwards, on seventh segment somewhat from the posterior end; the margins between the acute 



