364 CRUSTACEA. 



outer maxillipeds is rather longer than the second, and very densely 

 long hairy at its inner margin, and the second joint is densely villous 

 on part or all of its surface. The surface of the sternum between the 

 buccal area and the apex of the abdomen, and for a short distance 

 beyond, is densely short hirsute, but naked beyond this part. The 

 width of the penult segment is not more than two-thirds that of the 

 third. The reticulation of the pterygostomian surface is neat, and 

 extends over the sides of the carapax with the same regular character 

 and distinctness. 



Cydograpsus Gaimardii? EDWARDS, Crust., ii. 79. 



Chasmaynathus subquadratus, DANA, Proc. Acad. Nat. Sci. Philad., v. 251. 



CHASMAGNATHUS GRANULATUS. 



Carapax valde convexus, sat areolatus, fronte sinuato, media depresso A 

 juxta marginem minutd apiculato, margine antero-laterali tenui, 2-in- 

 ciso, dentibus triangulatis, acutis. Margo epistomatis inferior fronte 

 prominentior. Pedes antici maris crassi, subcequi, granulati, carpo 

 intus acuto, manu supra tenui et paulo dbtusd. Pedes postici valde 

 compressi, articulis 4fc> 5toque dorso paulo tomentosis, 5to pedis 2di 

 infra non tomentoso, tarso tenui, tenuiter sulcato et sulcis hirsuto. Ab- 

 domen maris lateribus fere rectum. 



Carapax very convex and considerably areolate ; front arcuate, slightly 

 excavate at middle, and having a minute point on the surface; 

 antero-lateral with two incisions. Posterior margin of epistome 

 more projecting than the front. Anterior feet of male stout, sub- 

 equal, granulate, carpus acute within, upper margin of hand a little 

 obtuse. Posterior feet much compressed, fourth and fifth joints 

 somewhat tomentose along the back, tarsus slender and fine sulcate, 

 with a range of short hairs on the sulci. Sides of abdomen nearly 

 straight and regularly convergent. 



Plate 23, fig. 6 a, male, natural size ; b, under view, enlarged two 

 diameters; c, male abdomen and sternum, natural size; d, hand, 

 natural size. 



Marshes of Lake Peteninga, near Rio Janeiro, Brazil. 



