124 CARL BOVALLIUS, THE OXYCEPHALIDS. 



however four or four and a half times as long as broad; that of the 

 sixth pair (PL VI, fig. 10) is more dilated, being about three arid a 

 half times as long as broad; the tibia and carpus are narrow and linear 

 in the male and in the not ovigerous female, but much inflated in the 

 female which carries eggs. The seventh pair consist of a single 

 bladder-like joint, which is broader below. 



The pleon is about as long as the peraeon, and is dorsally carinat- 

 ed. The under margin of the segments is feebly curved, the hind 

 corner is sharp-pointed, but scarcely produced. 



The urus is about as long as the last two pleonal segments 

 together; the first ural segment is thicker, and considerably shorter, 

 than the last coalesced segment. On the under side of the segments 

 run two marginal, serrated ridges. 



The first pair of uropoda (PL VI, fig. 11) in the adult male and 

 female are considerably shorter than the last pair, and do not reach to 

 the middle of that pair; they are more than twice as long as the second 

 pair, and have the inner ramus about half as long as the outer. The 

 second pair (PL VI, fig. 12) do not reach beyond the apex of the 

 last coalesced ural segment, and have the outer ramus a fourth part as 

 long as the inner, which is about a sixth part as long as the peduncle. 

 The third pair (PL VI, fig. 13, and p. 80, fig. 40) are much shorter 

 than the telson, and have the outer ramus very diminutive being shorter 

 than a twelfth part of the inner. 



The telson is straight, sharp-pointed, and has serrated margins; 

 it is much longer than the pleon and urus together. 



