﻿CRVSTACI'.A MAJ.ACOSTRACA. JI. jji 



its posterior iirotuberanct- soiiuwliat Iniig, longer tliaii deep, with tlie rounded liiiid iiiarj^iii situated 

 considerably before tlie front lower angle of second thoracic segment. Car])ns a little more than half 

 as long again as deep, with iht- u])])er margin \-er\- con\e.\, the free part of the lower margin feehlv 

 convex. Chela considerabh longer than the car])us, a little more than twice as long as broad, with 

 two strong setfe on the posterior margin, which is distinctly conve.v between the distal of these setae 

 and the base; nutvable finger considerably shorter than tlie anterior margin of the hand, somewhat 

 robust; when the fingers are adduced a triangular, oblong hole is seen between their proximal parts, 

 while the subdistal part of the incisi\e margin of the fixed finger is rather con\-ex. 



Thoracic segments (fig. 2a) taper slightly in breadth from second to seventh segment; their 

 lateral margins are feebly convex or nearly straight and a little curved at both ends. Second seg- 

 ment a little shorter than the third which is somewhat shorter than the fifth. — Thoracic legs some- 

 what . short. The two anterior ])airs ifig. 2b) are moderately strong, with sixth joint long, somewhat 

 shorter than fourth and fifth joints combined and considerabh' longer than se\-entli with claw; most 

 of their spines short. The three posterior pairs rather slender (fig. 2C); their sixth joint al)out as long 

 as the fifth but much shorter than seventh joint with claw; seventh joint and claw snbequal in length. 



Abdomen as long as seventh, sixth, fifth and half of the fourth thoracic segment combined 

 (fig. 2a). Fi\'e anterior segments with the ventral line straight (fig. 2d). Pleopods wanting. Sixth 

 segment distinctl\' shorter than the three jMeceding segments comliined (figs. 2d and 2e); its lateral 

 margins somewhat long and straight, while each half of the posterior margin is considerabh concave, 

 as the median half of the segment is produced posteriori)' into a triangle about twice as broad as 

 long and with the end acute (fig. 2d). — T'ropods as long as the straight lateral margin of the last 

 abdominal segment, moderately strong; peduncle, seen from the side (fig. 2 e), oblong rectangular; 

 endopod twice as long as the peduncle, with its proximal joint slightly less than twice as long as the 

 distal joint; exopod completeh' wanting. 



Length of the single specimen 1.7 """. 



Remarks. \. /'i/i//7'/\'i/ is easily distinguished from all other sjjecies mentioned in this paper 

 by having a well developed and two-jointed endopod but no exojiod on the uro]')ods; furthermore the 

 shape of the last abdominal segment is ver\' characteristic. 



Occurrence. Taken b\' the "Ingolf" at the following station. 



South-West of Iceland: St. 78: Lat. 60° 37' N., Long. 27° 52' W., 799 fm., temp. 4.5 ; i spec. 



Paranarthrura u. gen. 



Description. As to general aspect somewhat similar to T.rpfoi;iiatliin. The body tapers 

 con.siderably from the posterior ])art of the carapace or the front part of .second segment to the ab- 

 domen. — Anteiuiuke four-jointed and shaped as in /.,pf(><;i/ii/Ii/ii. Antcnn;c with fourth and fifth 

 joints completely fused. — Mouth-parts (examined only in /\ iiisi:;nis) somewhat aberrant; the lal)rum 

 (PI. XII, fig. 3c) is produced in a somewhat long, distalh obtuse triangle; the mandibles (fig.s. 3c 

 and 3d) arc somewhat long, without molar jjrocess, curved inwards far l)ey<md the middle, and the 



'IIr- Iiionlf l-XiH-.lition. III. j. I^ 



