CRUSTACEA MALACOSTRACA. II. 83 



as in the species of group a, scarcely as long as the two posterior segments combined; peduncle twice 

 as long as deep, distinctly more than half as long as the first joint of the endopod; the joints of the 

 endopod subequal in length and the first joint conspicuously less than twice as long as the two- 

 jointed exopod. 



Length of a female with marsupium 3-3"" n , of a female without marsupium 3.1""". 



Subadult Male. — The antennulae five-jointed and as usually much thicker than in the 

 female. In my single specimen the ventral tubercles on the four anterior abdominal segments are 

 somewhat higher than in the females, while the tubercle of the fifth segment is obtuse, but probably 

 damaged or misshaped. The pleopods are well developed (fig. 31); as fig. e, representing a pleopod of 

 the female, and fig- 3 f, representing that of the male, were drawn with the same degree of enlargement, 

 the comparison between these two figures will convey an idea of the enormous difference in size and 

 development, and it may be added that the female is considerably larger than the subadult male in 

 question. The endopod is nearly twice as long as the peduncle and has its distal rounded margin 

 furnished with setse as long as the ramus; the exopod is somewhat longer than the endopod, but the 

 setae along the terminal margin are only as long as those of the endopod. — Length of the spec- 

 imen 2.4 mm . 



Remarks. L. tuberculata is more slender than any among the above-described species; the 

 female is easily recognized by the nearly rudimentary pleopods and the development of the ventral 

 abdominal tubercles. The shape of the chelipeds and the relative length of the joints of the anten- 

 nulae afford additional characters. 



Occurrence. The species has been taken by the "Ingolf" at two deep-sea stations in the 

 warm area. 



Davis Strait: St. 24: Lat. 63°o6' N., Long. 56°oo' W., 1199 fm., temp. 2.4 ; 4 spec. 

 St. 36: Lat. 6i°5o' N., Long. 56°2i' W., 1435 fm., temp. 1.5°; 1 spec. 



53. Leptognathia uncinata n. sp. 



(PI. VIII, figs. 4a— 41.) 



Female (without marsupium). This species is closely allied to L. dent if era G. O. Sars, of 

 which a co-type presented by Sars himself has been examined. The two species agree with one an- 

 other in the following more important particulars. The antennulae are characteristic (fig. 4a); first 

 joint is considerably shorter than the three others combined, very thick, conspicuously less than twice 

 as long as deep; second joint is uncommonly long and thick, about two-thirds as long as the first, 

 somewhat produced above, and its upper margin a little longer than the two distal joints combined 

 and a little more than twice as long as the depth of the joint. ■ Antennae with fourth joint about 

 half as long as the fifth, and the articulation between them feebly developed. Chela (fig. 4 b) as long 

 as the carpus, twice as long as broad, with the two seta; on the posterior margin extremely thick; 

 the anterior distal angle above the insertion of the movable finger is protruding and even produced 

 as a short, obtuse process. — Second pair of legs (fig. 4 c) with fifth joint a little shorter than the 

 fourth and only half as long as the sixth, which is considerably longer than seventh joint with claw 



