STREETSIA CARINATA. 89 



is considerably shorter than the inner ramus, and a little shorter than the 

 outer; the inner ramus is lanceolate, sparingly serrated on both margins, 

 with spine-like teeth, and is more than three times as broad as the outer 

 ramus; the outer ramus is almost styliform, and is two-thirds as long the 

 inner; it is smooth on the outer margin, and serrated on the inner. 

 The telson has the margins smooth and tolerably convex. 



COLOUK. Yellowish, with the eyes dark brown. 



LENGTH. 10 mm. 



HAB. The tropical region of the Pacific, the Bay of Panama". 



5. Streetsia Steenstrupi, C. BOVALLIUS, 1887. 



PI. Ill, fig. 2-6; and p. 25, fig. 20; p. 29, fig. 38; p. 32, fig. 52; p. 33, fig. 55. 



Diagn. The head is a little longer than the whole perseon, the rostrum is 

 scarcely more than a third part 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 

 short, broadly triangular process; the hind margin of the 

 metacarpus is smooth, and is somewhat longer than the 

 under margin of the carpus; the dactylus is scarcely a third 

 as long as the metacarpus. The second pair are almost 

 cheliforin ; the front margin of the carpal process is nearly 

 straight and entirely smooth; the hind margin of the meta- 

 carpus is smooth, and is a little longer than the front margin 

 of the carpal process; the dactylus is half as long as the 

 metacarpus. The fourth pair are not longer than the third. 

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

 duced downwards into a short, rounded process, which reaches 

 about to the apex of the genu. The femur of the seventh 

 pair is only a fourth part shorter than that of the sixth, and 

 is somewhat longer than all the following joints together. 



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

 are scarcely produced, but are angular behind. 



The last coalesced ural segment is about a third part longer 

 than broad, and is about as long as the telson. 



The peduncle of the first pair of uropoda is longer than the last 

 coalesced ural segment, and much longer than the inner ramus. 



Nova Acta Reg. Soc. Sc. Ups. Ser. III. 12 



