10 BOVALLIUS, A NEW SWEDISH ISOPOD. 



The fourtli jyair are quite like the preceding one. 



The fifth pair (Pl. II. fig. 24) are a little larger, but of 

 the same form. 



The urus (Pl. I. fig. 1.) lias the form of a long tougue 

 or a sharp spade ; it is longer than broad ; its iipper side is 

 feebly convex, smooth, withouth granulations or tubercles. 

 The margins are perfectly even, not serrated, bv;t fringed 

 with a row of long plumose hairs (Pl. I. fig. 2). The urus 

 is longer than the pleon. It equals in length the pleon and 

 the last segment of the pereion together. 



The uropoda (Pl. II. fig. 25). The peduncle is long, 

 broader at the hinder margin;' the inner, hinder corner is 

 sharply angulated, but does not project into a long process 

 as in the other Rocinelas. The laminoe are long, lanceolate, 

 fully reaching to the end of the urus. The outer lamina is 

 shorter than the inner; both have even margins, fringed 

 with long plumose hairs. 



Length. 22 m. m. 

 Colour. Yellowish. 



Hahitat. Only one specimen, a small one, is known; this 

 was loosened with a knife from the outer side of the head 

 of a whiting, where it had fixed itself most tenaciously över 

 the opening of the gill cavity. It was caught in the summer 

 1880 at Marstrand, on the West coast of Sweden. 



