STREETSIA PORCELLUS. 83 



2. Streetsia porcellus, C. GLAUS, 1879. 



PL IV, fig. 46. 



Diagn. The head is about as long as the whole perseon; the rostrum 

 is considerably more than half as long as the rept of the head. 



The perceon is dorsally rounded. 



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

 rounded, without projecting corner, strongly denticulated, with 

 comparatively few, but very long and sharp, spine-like teeth; 

 the hind margin of the metacarpus is sparingly serrated; 

 the dactylus is longer than two-thirds of the metacarpus. 

 The under margin of the carpus of the second pair is finely 

 serrated, with the hind corner a little produced and sharp- 

 pointed; the hind margin of the metacarpus is serrated, and 

 considerably shorter than the under margin of the carpus; 

 the dactylus is longer than two-thirds of the metacarpus. 

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

 hind corner of the femur of the sixth pair is produced down- 

 wards into a short rounded process. The femur of the 

 seventh pair is about half as long as that of the sixth (?), 

 and somewhat longer than all the following joints together. 



The pleon is not carmated; the lateral parts of all the segments 

 are somewhat produced behind, and sharp-pointed. 



The last coalesced ural segment is about as long as broad, 

 and somewhat more than a fourth part shorter than the telson. 



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

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



The telson is not twice as long as broad. 



Syn. 1879. Oxycephalus porcellus, C. GLAUS. 27, p. 194 (48). 



1887. 36, p. 71, pL 24. 



fig. 7-9. 

 (Spec. A) TH. STEBBING. 1888. 39, p. 1587, pi. 



203. 



Streetsia porcellus differs from all its congeners in the broad urus 

 and in the form of the second pair of perasopoda, and especially in the fine 

 serration on the under margin of the carpus of that pair. I am pretty sure 

 that Oxycephalus porcellus, Specimen B, described and figured by STEBBING 



