XlPHOCEPHALUS LlLLJEBORGI. 131 



The urus is about as long as the whole pleon ; in the female it 

 is a little longer; the first ural segment is about as long as, or longer 

 than, the last coalesced segment. Both segments are serrated on the 

 under side. 



The first pair of uropoda (PL VII, fig. 18) are about as long 

 as the last pair, and reach fully to the middle of that pair; the first 

 pair are less than a third part longer than the second pair, and have 

 the inner ramus only a litde longer than the outer. The second pair 

 (p. 40, fig. 78) reach beyond the apex of the last coalesced ural segment, 

 and have the outer ramus only a little shorter than the inner. The 

 third pair (p. 40, fig. 79) are distinctly shorter than the telson, and 

 have the outer ramus somewhat more than half as long as the inner 

 (p. 40, fig. 81). 



The telson (p. 40, fig. 82) is sharp-pointed, and sometimes obli- 

 quely bent at the apex; it is considerably shorter than the urus. 



3. Xiphocephalus Lilljefoorgi, n. sp. 



The name is given in honour of Professor WILHELM LILLJEBORG of Upsaila. 



PI. VII, fig. 2124. 



Diagn. The head, without the rostrum, is a little longer than the 

 first five peraeorial segments. The neck is scarcely longer 

 than the ocular region. The rostrum is fully as long as the 

 person and pleon together. 



The seventh personal segment is more than half as long as 

 the sixth; the hind corner of the epimeral is somewhat 

 produced downwards, and is obtuse at the apex. 



The epimeral of the first pair of perceopoda is obtusely tri- 

 angular. The carpal process of the first pair is armed with 

 two small teeth on the hind margin; the lower hind corner 

 of the metacarpus is rounded. The femur of the fifth and 

 sixth pairs is narrow, not dilated. 



The pleon is dorsally smooth, not carinated. 



The first ural segment is as long as the last coalesced 

 segment. 



The first pair of uropoda are considerably longer than the 

 third, the second pair are much longer than the last coalesced 



