71 
of the stem of the uropoda, and exhibiting the form and armature characteristic 
of the genus. Colour dark yellowish grey or fuscous. Length 6 mm. 
RemarTcs. —This form was briefly described in the year 1855 by Prof. 
Lilljeborg as Cuma ampullacea, and was subsequently referred by the present 
author to the genus Diastylis. It is, however, unquestionably referable to the 
genus Leptostylis, exhibiting, as it does, all the leading features of that genus, 
though differing remarkably from the 2 preceding species in its unusually clumsy 
form of body. 
Occurrence. —Though nowhere in any abundance, I have found this form 
along the whole Norwegian coast, from the Christiania Fjord to Vadso, in mode¬ 
rate depths ranging from 30 to 100 fathoms. Fully adult male specimens have not 
yet come under my notice; but even in the immature state, the strong development 
of the superior antennse, so characteristic of the present genus, is very obvious. 
Distribution . — Kullaberg (Lilljeborg), Kattegat (Meinert), Atlantic coast 
of North America (Verrill). 
17. Leptostylis villosa, G. 0. Sars. 
(PI. L, fig. 2). 
Leptostylis villosa, G. 0. Sars. Undevsegelser over Christiamafjordens Dybvandsfauna, p. 40. 
Specific Characters. — Female. Anterior division of body greatly tumefied, 
almost globose in form, and very sharply marked of from the extremely slender 
tail. Carapace large and deep, more than twice as long as the exposed part of 
the trunk, and thickly covered with stiff hairs in a fur-like manner; pseudorostral 
projection very short and blunt, lower edges throughout divided into peculiar 
lamellar serrations. The first 2 pedigerous segments exhibiting a structure of the 
anterior edge similar to that in L. ampullacea. Tail (exclusive of the terminal 
appendages) exceeding the length of the anterior division, and exceedingly nar¬ 
row. Superior antennse with the last joint about the length of the 1st, but much 
narrower. First pair of legs very slender, exceeding the length of the anterior 
division of the body, basal joint scarcely attaining more than half the length of 
the leg, penultimate joint much longer than the antepenultimate, last joint com¬ 
paratively short; 2nd pair with the terminal joint very slender, exceeding the 
length of the antepenultimate; rudimentary exopodite of 3rd and 4th pairs 
extremely small though distinct. Uropoda of moderate length, inner ramus much 
longer than the outer, and nearly attaining the length of the stem, its 1st joint 
not nearly as long as the other 2 combined; spinules of the inner edge only 4 
in number (2 on the 1st, and 1 on each of the last 2 joints), apical spine slender, 
