CRUSTACEA MALACOSTRACA. II. 



89 



proximal third considerably thickened downwards. Second joint much produced above, very long, 

 having the upper margin distinctly more than half as long as that of the first joint, somewhat longer 

 than the two distal joints combined and more than twice as long as the depth of the joint; third 

 joint extremelv short; fourth joint considerably shorter than the second which is about as long as the 

 terminal setse. Antennae somewhat short; fourth and fifth joints completely fused, together conspic- 

 ouslv less than twice as long as sixth joint. 



Chelipeds (fig. 1 b) moderately robust. The basal joint is a little shorter than the carpus, its 

 posterior process long, almost twice as long as deep with the end somewhat distant from the front 

 lower end of second thoracic segment. Carpus a little less than twice as long as deep, with each of 

 the two halves of the lower margin somewhat feebly convex. Chela a little longer than the carpns, 

 a little more than twice as long as broad, presenting a somewhat peculiar aspect, because the posterior 

 margin is conspicuously convex; no protruding angle above the insertion of the movable finger, and 

 this finger is considerably shorter than the anterior margin of the hand and rather broad towards the 

 base; the fixed finger has an acute tooth near the end of the incisive margin. 



Second and third pairs of thoracic legs (fig. ib) somewhat robust; fourth joint with the posterior 

 spine rather long; fifth joint a little shorter than the fourth, with the distal anterior spine long and 

 much longer than the posterior; sixth joint not fully twice as long as the fifth and distinctly longer 

 than seventh joint with its claw. - - Three posterior pairs of legs moderately robust (fig. ic); the spines 

 on fifth and sixth joints long; sixth joint somewhat shorter than seventh with its straight claw. 



Abdomen as long as the two preceding segments combined ; the sixth segment (figs. 1 d and 1 e) 

 a little longer than the sum of the three preceding segments, thus a little longer than in the other 

 species of this genus; this segment is somewhat produced behind, so that the uropods are inserted at, 

 or even slightly before, the middle of its lateral margins, an arrangement producing a peculiar aspect. 

 The lower margin of each of the five anterior segments either somewhat convex or even showing a 

 somewhat low protuberance. — Uropods strong and considerably shorter than the sixth segment, 

 reaching somewhat beyond the end of abdomen; peduncle much deeper than long; first joint of the 

 endopod only half as long as the second, but yet a good deal longer than the small, one-jointed exopod. 



Length of the largest specimen 1.7 mm . 



Remarks. This species is easily recognized by the terminal part of the abdomen with its 

 last segment produced posteriorly and the characteristic uropods originating at the middle of the 

 lateral margins of the segments; the shape of the body, the anteunuke, the chelipeds afford further 

 characters. — Mouth-parts unknown. 



Occurrence. It has been taken by the "Ingolf" at a single station. 



Davis Strait: St. 24: Lat. 63°o6' N., Long 56°oo' W., 1199 fm., temp. 2.4°; 3 spec. 



57. Leptognathia ventralis n. sp. 

 (PI. VIII, figs. 7 a- 7k. 1 



Female. Body slender (fig. 7a), about seven times as long as broad, decreasing somewhat in 

 breadth from the carapace to the end of abdomen. Carapace as long as, or even slightly longer 



The [ngoltExpcdition III. 5. I2 



