70 



length. Appendages transformed in a similar manner to that in the male of 

 L. longimana. 



Remarks. This form is nearly allied to the type species, though easily 

 distinguishable in both sexes, being especially recognizable by the extremely slender 

 and narrow tail, and by the coarsely serrated lateral keels of the carapace in 

 the male. 



Occurrence. I first found this form off the Lofoten Islands, and have 

 subsequently met with it also in several other places on the Norwegian coast, 

 for instance, in the outer part of the Hardanger Fjord, at Aalesund, in the Trond- 

 hjem Fjord, and at Vads0. It is generally found in depths ranging from 50 to 

 150 fathoms, muddy clay. 



Distribution. Stat. 33 of the Norwegian North Atlantic Expedition (the 

 present author). 



16. Leptostylis ampullacea (Lilljeborg). 



(PI. L, fig. 1). 

 Cuma ampullacea, Lilljebovg, 0fv?rs. Vet. Akad. Forh. 1855, p. 120. 



Syn: Diastylis ampullacea, G. O. Sars. 



Specific Characters. female. Body comparatively short and clumsy, with 

 the anterior division much tumefied and considerably vaulted above. Carapace 

 large and somewhat sloping in front, surface smooth and clothed with scattered 

 slender hairs, pseudorostral projection comparatively short and bluntly triangular 

 in form, subrostral corners rounded off, inferior edges coarsely serrate in their 

 anterior halves. The first 2 pedigerous segments each having the anterior edge 

 emarginated in the middle, and forming on each side of the emargination a slight 

 appressed lappet. Tail (exclusive of the terminal appendages) scarcely longer 

 than the anterior division, and comparatively less slender than in the 2 preceding- 

 species. Superior antenna with the 1st joint of the peduncle almost as long as the 

 other 2 combined. First pair of legs not much elongated, scarcely exceeding in 

 length the carapace, basal joint about the length of the last 3 joints combined, 

 penultimate joint somewhat longer than the antepenultimate one, last joint com- 

 paratively short; 2nd pair witli the terminal joint nearly as long as the ante- 

 penultimate one ; the 3 posterior pairs less slender than in the 2 preceding species. 

 Uropoda comparatively short, inner ramus almost as long as the stem, and exceeding 

 the outer by about Vs of its length. 1st joint about the length of the other 2 

 combined, spinules of the inner edge 5 in number (3 on the 1st, and 1 on each 

 of the last 2 joints), apical spine slender, setiform. Telson about half the length 



