CRUSTACEA MALACOSTRACA. II. I2 i 



its posterior protuberance somewhat long, longer than deep, with the rounded hind margin situated 

 considerably before the front lower angle of second thoracic segment. Carpus a little more than half 

 as long again as deep, with the upper margin very convex, the free part of the lower margin feebly 

 convex. Chela considerably longer than the carpus, a little more than twice as long as broad, with 

 two strong setse on the posterior margin, which is distinctly convex between the distal of these setse 

 and the base; movable finger considerably shorter than the 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 incisive margin of the fixed finger is rather convex. 



Thoracic segments (fig. 2 a) 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 pairs (fig. ab) are moderately strong, with sixth joint long, somewhat 

 shorter than fourth and fifth joints combined and considerably longer than seventh with claw; most 

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

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



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

 (fig. 2a). Five anterior segments with the ventral line straight (fig. 2d). Pleopods wanting. Sixth 

 segment distinctly shorter than the three preceding segments combined (figs, ad and 2e); its lateral 

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

 as the median half of the segment is produced posteriorly into a triangle about twice as broad as 

 long and with the end acute (fig. 2 d). Uropods as long as the straight lateral margin of the last 

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

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

 distal joint; exopod completely wanting. 



Length of the single specimen 1.7 """. 



Remarks. S.indivisa is easily distinguished from all other species mentioned in this paper 

 by having a well developed and two-jointed endopod but no exopod on the uropods; furthermore the 

 shape of the last abdominal segment is very characteristic. 



Occurrence. Taken by the "Ingolf" at the following station. 



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



Paranarthrura n. gen. 



Description. As to general aspect somewhat similar to Leptognathia. The body tapers 

 considerably from the posterior part of the carapace or the front part of second segment to the ab- 

 domen. Antennulae four-jointed and shaped as in Leptognathia. Antennae with fourth and fifth 

 joints completely fused. Mouth-parts (examined only in P. insignis) somewhat aberrant; the labrum 

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

 and 3d) are somewhat long, without molar process, curved inwards far beyond the middle, and the 



The Ingolf-Kxpcdition. III. 3. l6 



