CRUSTACEA MALACOSTRACA. III. 69 



anal doors is considerably larger than in the males of H. dentatus or H. frigidus. — Uropods long, 

 scarcely two-thirds as long as the abdomen. 



Length of the preserved part of the body 37 mm. 



Remarks. H. longiremis is easily distinguished from the two following species, and, besides, 

 from the two North-Atlantic species described by Richardson by having in both sexes the fifth seg- 

 ment longer both in proportion to thickness and to length of the coalesced part of the body, and by 

 having the female operculum proportionately broader with the hind margin long and slightly convex, 

 and finally by the long male uropods, etc. 



Occurrence. Taken by the "Ingolf" at a single very deep station in the warm area. 



Davis Strait: Stat. 36: Lat. 6i°5o' N., Long. 56°2i' W., 1435 fath., temp. 1-5°; 2 very mutilated spec. 



43. Heteromesus Schmidtii n. sp. 



(PI. VI, figs. 3 a-3 e). 



Female (without marsupium). Body somewhat robust, not fully five times as long as the 

 breadth of first thoracic segment, finely granulate, but only on the lateral part of the last abdominal 

 segment and the last thoracic segment can the granules be said to be real sharp minute tubercles; 

 the head and the thoracic segments, excepting the major portion of fifth segment, adorned on the 

 upper surface with irregular wavy markings or impressions. 



Autennulae (fig. 3 b) nearly half as long as first thoracic segment with head ; second joint 

 distinctly shorter than the interval between the antennula;, and it has above near the distal end a small 

 tubercle, which on closer examination is seen to consist of three extremely short joints (fig. 3 c), the 

 first distinctly longer than, and more than twice as broad as, the second, while the third is somewhat 

 .smaller than the second, and has on the end a somewhat short and a long robust seta. — The antennae 

 have the third joint conspicuously longer than the sixth, as long as first segment with head, and it 

 has no proximal process at the lower side and no subterminal process at the rounded end (the end of 

 the flagellum lost in my specimen). — The labrum has each autero-lateral angle produced in a small 

 but conspicuous tooth (fig. 3 b). 



First thoracic segment has each anterolateral angle produced into a somewhat small protube- 

 rance; some few tiny tubercles are more or less distinct on the upper surface of the four anterior 

 segments, and a similar pair are found on the lateral margins of second segment. Fifth segment 

 sybcylindrical, with the terminal part not much expanded; it is not fully twice as long as broad at 

 its anterior end, and considerably shorter than the posterior coalesced part of the body, but conspicu- 

 ously longer than the abdomen. 



First pair of thoracic legs robust; the leg preserved seems to be shaped and armed nearly as 

 in H. frigidus (comp. fig. 4 p), but the fifth joint has distally below a less sharp angle, and sixth joint 

 is very robust with at least two strong spines. The other six pairs of legs differ from those in H. 

 longiremis in being distinctly shorter and less slender, and in having the second joint scabrous, set 

 with numerous minute, sharp teeth; second joint of fourth pair, when directed backwards, reaches 

 beyond the end of the corresponding joint of fifth pair stretched forwards. 



