71 



of the stem of the uropoda, and exhibiting the form and armature characteristic 

 of the genus. ( 1 olour dark yellowish grey or fuscous. Length 6 mm. 



Remarks. 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 Li'i^oxtijlls, 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 Vads0, 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 antennae, 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. 



(PL L, fig. 2). 

 Leptostylis idllosa, G. 0. Sars. Undersegelser over Christianiafjordens 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 antennae 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 halt 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, 



