27 

 1. Leptognathia longiremis (Liljeb.) 



(Tl. XII). 



Tanais longiremis Lilljeborg, 1. c. p. 19. 



Syn: Tanais islandicus, G. 0. Sars. 



Specific Characters. — Body of female rather slender and elongated, 

 more than 7 times as long as it is broad; cephalosome about the length of the 

 first 2 segments of mesosome combined, with the proximal half of uniform breadth, 

 the distal one abruptly attenuated; first free segment of mesosome about same 

 size as the last one, both being shorter than the others ; metasome well developed, 

 exceeding in length the last 2 segments of mesosome combined, terminal segment 

 nearly occupuying l / 3 of the length of metasome, and armed on each side with a 

 minute deflexed denticle. Body of male much shorter than in female, being 

 scarcely more than 5 times as long as it is broad; cephalosome rather broad in 

 proportion to its length; all free segments both of mesosome and metasome of 

 about equal length, the terminal one narrowly produced at the tip. Superior 

 antenna' in female gradually tapering distally, basal joint about equalling in 

 length the other 3 combined, 2nd joint shorter than the outer 2 taken together; 

 those in male attaining in length 7-t of the body, the first 2 joints of the peduncle 

 large and expanded, flagellum about the length of the peduncle, and having the 

 2 outer joints much longer than the other 2. Chelipeds in female rather strong, 

 with the hand considerably dilated, ov.al triangular in form, and scarcely smaller 

 than the carpus, with a slight dentated crest in front at the insertion of the 

 dactylus, the latter crested along the middle, thumb distinctly serrated at the 

 end inside; those in male with the hand much narrower than in female, and 

 furnished inside with a transverse row of about 10 flattened spines increasing in 

 length behind, fingers quite simple, pointed, the immovable one rather short. 

 Uropoda in female attaining half the length of the metasome, both rami Inarti- 

 culate, the inner one more than 3 times as long as the outer, and tipped by 

 rather long seta 1 ; inner ramus in male distinctly triarticulate. Length of female 

 3.75 mm., of male 2.55 mm. 



Remarks. — This is the largest and finest of the Norwegian species, and 

 may, moreover, easily be recognized by the structure of the chelipeds and uro- 

 poda, as also by the dentiform projection occurring on each side of the terminal 

 segment of the metasome. The form at first recorded by the present author 

 from the Norwegian North Atlantic Expedition as Tanais islandicus is undoubtedly 

 identical with Lilljeborg's species. 



Occurrence. — The species occurs along the whole Norwegian coast, 

 from Christianiafjord to Vadsii in depths ranging from 30 to 100 fathoms. 



