9 2 



CRUSTACEA MALACOSTRACA. II. 



Chelipeds (fig. 2 b) moderately strong. The basal joint somewhat large, a little shorter than the 

 carpus, with the posterior protuberance well developed and the free rounded hind margin a little in 

 advance of the front lower end of second thoracic segment. Carpus a little more than twice as long 

 as deep, with its lower margin rather feebly curved. Chela somewhat longer than the carpus, almost 

 two and a half times as long as broad; movable finger somewhat robust, as long as the anterior 

 margin of the hand. 



Thoracic segments, seen from above (fig. 2 a), with the lateral margins somewhat angular; on 

 second to fourth segment the angles are situated before the middle and more or less rounded, on 

 fifth and sixth segment the angles are respectively a little and somewhat behind the middle and 

 moderately sharp, while on seventh segment no angle but a rounded protuberance is seen on each 

 side near the posterior margin. Second segment somewhat or considerably shorter than the third, 

 without any ventral process, but second, third and fourth segments have their lateral margins behind 

 the insertion of each leg produced in a somewhat broad, oblong, acute process (fig. 2 b) directed down- 

 wards and distally curved forwards; the processes on second segment are somewhat large and larger 

 than those on the two other segments; the processes are not visible when the animal is seen from 

 above. - - Thoracic legs (figs. 2 b and 2C) somewhat long and slender, with sixth joint distinctly shorter 

 than seventh with claw. Second and third pairs (fig. 2 b) subequal; posterior spine of fourth joint 

 rather long; fifth joint about as long as the fourth, with its two distal spines of very moderate length. 



Abdomen as long as seventh, sixth and half of fifth segment combined, decreasing distinctly 

 in breadth backwards; sixth segment shorter than the three preceding segments combined but only a 

 little shorter than broad, broadest at the middle, and with the proximal part of the lateral margins 

 somewhat concave. Ventral margin of the five anterior segments somewhat convex (fig. 2d); no 

 pleopods. — Uropods (fig. 2d) slender, about as long as the sum of the two posterior segments; ped- 

 uncle a little longer than deep; eudopod with second joint distinctly longer than the first; exopod 

 slightly more than half as long as first joint of the endopod. 



Length of the largest specimen 1.7 mm . 



Remarks. L.acanthifera is easily separated from all other species by the lateral processes of 

 second to fourth segment; furthermore the antennuke are somewhat short and the uropods characteristic. 



Occurence. Taken by the "Ingolf" at a single deep-sea station. 



Davis Strait: St. 36: Lat. 6i° 59' N., Long. 50° 21' W., 1435 fm., temp. 1.5 ; 3 spec. 



Group c, subdivision /} (vid. p. 85). 



59. Leptognathia breviremis Lilljeborg. 

 PI. IX, figs. 3 a— 3 g). 



1864. Tanais breviremis Lilljeborg, Bidrag til kannedomen om de inom Sverige och Norrige 



forek. Crust, of .... Tanaidernas familj, p. 21 (Female). 

 ! 1896. Lrptognatluii breviremis G. O. Sars, Account Crust. Norway, Vol. II, p. 28, PI. XIII, fig. 1. 



Female. Though Sars has published a good description with figures of this form, it may be 

 useful to point out a number of features. 



