XiPHOCKPHALUS BKEVICAUDATUS. 133 



The urus is scarcely longer than the last two pleonal segments 

 together, and is thicker, and more robust, than in the two preceding 

 species. The first segment is quite as long as the last coalesced 

 segment. 



The first pair of uropoJa are about a fifth part longer than the 

 last pair, and reach far beyond the middle of that pair; the first pair 

 are more than, a third part longer than the second, and have the outer 

 ramus about as long as the inner. The second pair reach far beyond 

 the apex of the last coalesced ural segment, and have the outer ramus 

 only a little shorter than the inner. The third pair reach almost to 

 the apex of the telson, and have the outer ramus not half as long as 

 the inner. 



The telson is comparatively thick, is straight and sharp-pointed, 

 and is quite as long as the urus. 



4. Xipliocephalus brevicaudatus, Th. Stebbing, 1888. 



X. 



■ i 



I» 



Diagn. The head^ without the rostrum, is longer than the whole perteon. 



The neck is a third part longer than the ocular region. \^ 



The seventh perœo7ial segment is only a little shorter than 

 the sixth; the hind part of the epimeral is somewhat deeper 

 than the front part, and is broadly rounded. 



The epimeral of the first pair of perœopoda is as deep as 

 long (?), with rounded corners. The carpal process of the 

 first pair is finely denticulated on the hind margin; the lower 

 hind corner of the metacarpus is squared. The femur of 

 the fifth and sixth pairs is moderately dilated. 



The pleon is dorsally smooth, not carinated (?). 



The first ural segment is half as long as the last coalesced 

 segment. 



The first pair of uropoda are much longer than the third; 

 the second pair are much longer than the last coalesced 

 ural segment, and are quite as long as the third pair. The 

 outer ramus of the first pair is about half as long as the 

 inner; that of the second pair is not a sixth part as long 

 as the inner; that of the third pair is minute, not a tenth 

 part as long as the inner. 



