92 CARL BOVALLIUS, THE OXYCEPHALIDS. 



fifths of the length of the telson ; the peduncle is much shorter than the 

 inner ramus, and a little shorter than the outer; the inner ramus is 

 elongate-lanceolate, serrated on both margins, and considerably broader 

 and longer than the outer ramus, which is serrated as in the preceding pair. 

 The tehon has the margins smooth and tolerably convex. 



COLOUR. Almost hyaline. 



LENGTH. 10 12 mm. 



HAB. The tropical region of the Atlantic. 



6. Streetsia longiceps, C. GLAUS, 1879. 



PI. IV, fig. 3. 



Diagn. The head is as long as the whole peraeon; the rostrum is 

 nearly half as long as the rest of the head. 



The perceon is dorsally rounded. 



The under margin of the carpus of the first pair of perceopoda 

 is entirely smooth (?) with the hind corner projecting into a 

 long narrow sharp-pointed process; the hind margin of the 

 metacarpus is smooth (?) and somewhat shorter than the 

 under margin of the carpus; the dactylus is not half as long 

 as the metacarpus. The second pair are cheliform; the front 

 margin of the carpal process is smooth (?) the apex narrowly 

 sharp-pointed; the hind margin of the metacarpus is smooth (?) 

 and is about as long as the front margin of the carpal 

 process; the dactylus is riot half as long as the metacarpus. 

 The fourth pair are only a little longer than the third. 

 The lower hind corner of the femur of the sixth pair is 

 scarcely produced. The femur of the seventh pair is about 

 half as long as that of the sixth, and is as long as all the 

 following joints together. 



The pleon is not carinated; the lateral parts of the segments 

 are produced behind, and sharp-pointed. 



The last coalesced ural segment is a little longer than the 

 telson. 



The peduncle of the first pair of uropoda is a little longer 

 than the inner ramus. 



Syn. 1879. Oxycephalus longiceps, C. CLAUS. 27, p. 194 (48) 



36, p. 72, pi. 24, fig. 10. 



