132 CRUSTACEA. 



SUBFAMILY 

 EPIALTUS BKASILIENSIS. 



Parvulus, subhexagonus, parce convexus, Icevis, regione mediand mi- 

 nut bituberculatus, pone oculos dente parvulo appresso notatus ; rostro 

 fere equilateraliter triangulate, integro; laterlbus cmgidate salientibue 

 angulis obtusis, longitudine post-orbitali latit'udinem majorem cequante. 

 Pedes sex postici breviores, articuli dente in/eriore quinti juxta basin 

 maxima. Abdomen maris 6-articulatum ; feminae 5-articulatum, 

 orbiculatum. 



Small, subhexagonal, sparingly convex, smooth, stomach region with 

 two minute tubercles, a small close appressed tooth just behind the 

 eyes; beak entire, nearly equilaterally triangular; sides angularly 

 salient, angles obtuse, post-orbital length equalling greatest breadth. 

 Six posterior feet shorter than others, tooth on lower side of fifth 

 joint very prominent and proceeding from near the base of the 

 joint. Abdomen of male, six-jointed ; of female, five-jointed, orbi- 

 cular. 



Plate 6, fig. 1, male, enlarged three diameters. 

 Eio Janeiro, along sea-shore, among the sea-weed. 



This species is very near the bituberculatiis of Chili, and corresponds 

 with the brief description of this species by Milne Edwards (Crust., i. 

 345). But his figure (Plate 15, fig. 11), represents a species of nar- 

 rower proportions, and beak, and the very prominent tooth on the 

 fifth joint is not given ; the greatest breadth, instead of being equal to 

 the distance from the posterior margin to the eyes, is shorter than 

 this by very nearly the distance between the eyes and the tubercles. 

 Moreover, the tooth on the margin behind the eyes, is not represented 

 in the figure of the Vitviberculatus. The tubercles are almost obsolete 

 in the brasiliensis, and the anterior angles of the carapax, posterior to 

 the eyes, are short truncate. 



