69 
unusually prolonged 1st pair of legs. It 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 Drobak. 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. 
(PI. XLIX). 
Leptostylis maerura, (i. O. Sars. Nye Dybvandscrustaceer fra Lofoten. Chr. Yid. Selsk. 
Forhandl. 18o9, 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 
antennse 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 setae. 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. 
