69 



unusually prolonged 1st pair of legs. Tt may be regarded as the type of the 

 present genus, and also in other respects is easily recognizable from the 3 other 

 Norwegian species. 



Occurrence. I first found this form in the Christiania Fjord, both in the 

 immediate vicinity of Christiania, and at Dr0bak. Subsequently I have also met 

 with it, though rather sparingly, in some other places on the south and west 

 coasts of Norway, as far north as the Lofoten Islands. It generally occurs in 

 depths ranging from 30 to 100 fathoms, muddy bottom. 



Distribution. Off the Skagen Lighthouse (Meinert), Atlantic coast of 

 North America (Verrill). 



15. Leptostylis maerura, G. 0. Sars. 



(I'l. XLIX). 



-in-ft, G. 0. Sars. Nye Dybvandscrustaceer fra Lofoten. Chr. Vid. Selsk. 

 Forhandl. 1869, pag. 156. 



Specific Characters. Female. General form of body resembling that of 

 the preceding species, the anterior division being very tumid, almost globose in 

 form, and sharply marked off from the slender tail. Carapace large, more than 

 twice as long as the exposed part of the trunk, and but slightly vaulted above, 

 surface smooth, though rather densely clothed with hairs, pseudorostral projection 

 comparatively shorter than in the type species. Tail (exclusive of the terminal 

 appendages) much longer than the anterior division, and very narrow. Superior 

 antenna* less elongated than in L. longimana. last joint of the peduncle much 

 shorter than the 1st, and setiferous only at the end. First pair of legs slender, 

 though not nearly so elongate as in the type species, basal joint exceeding half 

 the length of the remaining part of the leg, penultimate joint about the length 

 of the 3 preceding joints combined, last joint rather short; 2nd pair with the 

 terminal joint shorter than the antepenultimate one; 3rd and 4th pairs very 

 narrow, rudimentary exopodite with 3 apical setse. Uropoda less elongated than 

 in L. longimana, inner ramus with the last joint longer than the 1st, spinules 

 of inner edge 5 in number (2 on the 1st joint, 1 on the 2nd, and 2 on the last), 

 apical spine very slender, setiform. Telson very small and but slightly narrowed 

 distally, exhibiting a similar armature to that in L. longimana. Colour greyish 

 white. Length about 5 mm. 



Adult male comparatively more slender than that of the type species. 

 Carapace somewhat more depressed than in female, and provided on each side 

 with a very conspicuous, coarsely serated carina extending throughout its entire 



10 Crustacea. 



