Streetsia pronoïdes. 85 



carpus; the dactylns as in the first pair. The fourth pair 

 are not longer than the third. The lower hind corner of 

 the femur of the sixth pair is produced downwards into a 

 rounded process, which reaches beyond the apex of the genu. 

 The femur of the seventh pair is more than half as long 

 as that of the sixth, and is longer than all the following 

 joints together. 



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

 are angular behind. 



The last coalesced tiral segment is nearly twice as long as 

 broad at the base, and is quite as long as the telson. 



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

 the last coalesced ural segment, and is considerably longer 

 than the inner ramus. 



The telson is elongate-triangular, and is about three times as 

 long as it is broad as the base. 



Syn. 1887. Oxycepbalus pronoïdes, C. Bovallius. 35, p. 37. 



Streetsia pronoïdes is distinguished from its congeners by 

 the very short dactylus of the first two pairs of peraeopoda, and by the 

 ovate, not posteriorly dilated femur of the seventh pair. 



The body is comparatively high and compressed, but not carinated. 



The hind part of the head is not constricted; the rostrum seen 

 from above (p. 23, fig. 9) is narrowly triangular, evenly tapering from 

 the base towards the apex. 



The perœo7i is comparatively long with high and large epimerals. 



The first pair of perceopoda (PI. Ill, fig. 8) have the carpus 

 longer than broad; the hind margin is fringed with five or six long- 

 bristles; the lower corner is obtusely rounded, and shows no teeth on the 

 hind margin, but has six short and broad triangular teeth on the under 

 margin, the outermost of which is the broadest and is obtusely round- 

 ed at the apex ; both sides of the lower hind corner of the joint are 

 set with a large number of long stout bristles; the metacarpus is very 

 broad, scarcely more than a third part longer than broad; the front side 

 is strongly convex, and fringed with long bristles; the hind margin forms 

 a thin edge, bluntly serrated, and bordered by short bristles; the short 

 dactylus is smooth on the hind margin. The second pair (PI. Ill, fig. 9) 

 have the hind margin of the carpus fringed with bristles, as in the first 



