S. I. Smith on Brazilian Crustacea. 27 



Several specimens give the following measurements : — 



Length of body from tip of rostrum to ex- 

 tremity of abdomen, 

 Lengtii of carapax from orbit to middle of 

 posterior margin, . - - - 



Breadth of carapax, 

 Length of rostrum from its tip to base of eyes, 



" basal scale of antenna, 



" first thoracic legs, 



" merus in first thoracic legs, 



" carpus " " 



" hand " " 



" second thoracic legs, - 



" merus in second thoracic legs, 



" carpus " " 



hand 



" dactylus " " 



A large nmnber of specimens of this fine species were obtained by 

 Prof Hartt at Para. 



Peneus Brasiliensis Latreiiie. 



Peneus Brasiliensis Latreiiie, Nouveau Dictionnarie d'Histoire naturelle, tome xxv, 

 p. 154 {teste Edwards); Edwards, Histoire naturelle des Crust, tome ii, p. 414; 

 White, List of Crust, in the British Museum, p. 80; Gibbes, loc. cit., p. 198. 



I refer to this species a large number of small specimens obtained 

 by Prof. Hartt at Bahia. They agree perfectly with a specimen from 

 the west coast of Florida, which is undoubtedly the same as the 

 species described by Gibbes from South Carolina. 



Xiphopsneus, gen. nov. 

 The cai-apax is much as in Peneus, but the rostrum is very long, its 

 extremity very slender, and the gastro-hepatic sulcus is scarcely per- 

 ceptible, while the cervical and branchio-cardiac sulci are distinct. 

 The antennuLo?, are long and slender, and the peduncle has only a very 

 small lamelliform appendage on the inside, which is not foliaceous and 

 expanded over the eye as in Peneus / the flagella are very long and 

 slender, the upjier ones being much stouter and longer than the lower. 

 The antenna?, maxillipeds and the three anterior pairs of thoracic legs 

 are nearly as in Peneus. The fourth and fifth pairs of thoracic legs 

 are very long, and the terminal segments very slender and flagelliform. 

 The abdomen is quite similar to Peneus, but the lamella3 of the 

 appendages of the first five segments are much longer than is usual 

 in that s:enus. 



