22 -iS'. I. Smith on Brazilian Crustacea. 



similar process from the extremity of the propodus, both processes 

 being hairy upon the outside and having horny, spoon-shaped tips. 



The abdomen is nearly smooth, and all the segments, except the ter- 

 minal, are crossed by a narrow and thickly ciliated sulcus, which is 

 interrupted in the middle on the third, fourth and fifth segments. The 

 first segment has a single, short lateral tooth. The remaining seg- 

 ments, except the last, have this tooth spiniform and vei-y large, and 

 a small additional one behind it ; the larger tooth is armed, except in 

 the penultimate segment, with one or two small spines or denticles on 

 the anterior edge, near the base. The posterior edge of the penulti- 

 mate segment above is armed with close set, sharp teeth. 



The lanielliform appendages of the sixth segment of the abdomen 

 are of about equal length, broad and truncate at the tips. The lamella 

 of the last segment is slightly narrowed and truncate at the ti}), and 

 does not extend beyond the lamellie of the sixth segment. In the 

 male, the lamelliB of the second to the fifth segment are ovate and all 

 of about the same size. In the female, these lamella? are very much 

 larger ; in the second segment, the inner one is of the same form and 

 nearly of tlie same size as the outer; in the three following segments 

 the outer lamella? decrease in size successively, and the inner lamellae 

 are each composed of two branches, the outer branch being narrow, 

 triangular, its edges thickened, multi-articulate and clothed with long 

 hairs ; the inner branch slender, not tapering, articulated at the base 

 of the outer branch, not jointed like the outer branch, but composed 

 of a single piece, and clothed beneath and at the tip with long hairs. 



Two specimens give the following measurements : — 



Length of body from base of antennulaj to extremity of ab- 

 domen, ------- 



Length of carapax from base of antennulaj to middle of pos- 

 terior margin, . - . . - 



Breadth of carapax, . - . . - 



Length of antennulie, . . . - - 



" inner flagellum of antennula>, 



" outer " " . - - 



" antennae, . - - - - 



" first thoracic legs, . . - - 



" second, " - 



" third, " . - - . 



" fourth, ''.-..- 



fifth, " ... - 



Several specimens were obtained at Pernambuco. 

 This species appears to be closely allied to the P. guttatus of the West 

 Indies, but that species, according to Edwards' description and figure 



