82 CARL BOVALLIUS, THE OXYCEPHALIDS. 



C. The last ural segment is longer than the telson. The 

 under margin of the carpus, and the hind margin of 

 the metacarpus of the first pair of perseopoda are 

 smooth. The dactylus of the first two pairs is not half 

 as long as the metacarpus. The femur of the seventh 

 pair is as long as all the following joints together. 6. S. longiceps. 



1. Streetsia Challenger!, TH. STEBBING, 1888. 



Diagn. The head is nearly as long as the peraeon and pleon together; 

 the rostrum is considerably more than half as long as the 

 rest of the head. 



The perceon is dorsally rounded. 



The under margin of the carpus of the first two pairs of perceo- 

 poda is serrated, with the hind corner projecting into a long, 

 sharp tooth; the hind margin of the metacarpus is serrated 

 and fully as long as the under margin of the carpus; the 

 dactylus is more than half as long as the metacarpus. The 

 fourth pair are much longer than the third. The lower hind 

 corner of the femur of the sixth pair is produced downwards 

 into a very long, sharp-pointed process reaching considerably 

 below the apex of the genu. The femur of the seventh pair 

 is much more than half as long as that of the sixth, and 

 is a little longer than all the following joints together. 



The pleon is dorsally carinated, with the lateral parts of the 

 last two segments acutely produced behind. 



The last coalesced ural segment is not twice as long as broad, 

 and only half as long as the telson. 



The peduncle of the first pair of perceopoda is quite as long 

 as the last coalesced ural segment, and a little longer than 

 the inner ramus. 



The telson is about four and a half times as long as broad, 

 and is carinated. 



Syn. 1888. Streetsia Challenger!, TH. STEBBING, 39, p. 1603, pi. 207. 

 For further details I refer the reader to the work of STEBBING. 



COLOUR ? 



LENGTH. A little over an inch* (STEBBING). 



HAB. The North Pacific; Lat. 35 35' N, Long 150 50' E. One speci- 



men, a female (STEBBING). 



