Canon A. M. Norman on Jseropsis Dollfusi. 291 



Fam. Janiridae. 



Genus J^ROPSIS, Koehler. 



JcBropsis Dollfusi^ sp, n. (PI. V. figs. 2-8.) 



There is a marked similarity in the three species of this 

 genus which are now known as regards the general outline of 

 the body, and especially the structure of the mesosomes, which 

 are distinctly separated from each other, as also in the general 

 character of the antennules and antennee. In the present 

 species the prosome or cephalon is subquadrate, the length 

 and breadth being subequal ; the anterior margin is emar- 

 ginate, and in front of this the buccal organs are conspicu- 

 ously projected ; the lateral margins are slightly convex 

 opposite to the eyes, which are situated at some distance from 

 the frontal margin. The metasome (or pleon) is semielliptic, 

 narrowing from the base to the extremity, where the small 

 uropods are attached; each lateral margin is serrated, the 

 serrations being eight in number. 



The antennules (PI. V. fig. 3) have the basal joint expanded, 

 the length and breadth subequal ; the distal portion of the 

 outer margin is cut into several spine-like processes, and the 

 extremity of the inner margin has also two projecting points ; 

 the second joint is of about the same length as the first, but 

 is much narrower, it slightly widens towards the extremity ; 

 the last joint of the peduncle is again much narrower than 

 the second and much shorter; the flagellum is composed of 

 only two articulations, the first of winch is much shorter than 

 the terminal long joint. 



The antennas (fig. 4) have the first three joints very short ; 

 the fourth, which is the first of those represented in the figure, 

 is very large and wide, with the outer margin expanded and 

 remarkably crenulated; the last two joints of the peduncle 

 are also large and massive, the last, which is longer than the 

 penultimate, gradually tapers to the extremity to receive the 

 small flagellum, which does not equal half its length and is 

 composed of four or five articulations. 



The legs are of nearly similar general structure to those of 

 the genus Jcera, and end in two nails of equal length. 



The uropods (fig. 7) are minute and terminate in two lobes, 

 of which the outer is furnished with a bunch of sette and the 

 inner ends in a strong curved nail. 

 Length 3*25 millim. 



Found in material dredged near the island of Capri in the 

 Bay of Naples. 



