342 CRUSTACEA. 



breadth of third joint of fourth pair of legs, four lines ; breadth of 

 fifth joint, two and three-fourths lines, or less than half the third ; 

 breadth of tarsus at base, four-fifths of a line. This species is very 

 near the lividus, and is in most points very well represented by the 

 figure of that species. But the tarsus and the two preceding joints 

 are very much more slender ; the epistome has not a straight margin 

 behind, but curved, as in figure 6 a; the emargination at the outer 

 extremity of the orbit is very shallow ; the third joint of the outer 

 maxillipeds is similarly oblong, but has a few unequal hairs along the 

 whole length of the inner margin ; the striae of the carapax and legs 

 are much shallower. The pterygostomian region is pubescent ; the 

 front nearly vertical ; the posterior apex of third joint of fifth pair of 

 legs entire. 



G. crinipes, DANA, Proc. Acad. Nat. Sci. Philad., 1851, v. 249. 



GENUS GONIOGRAPSUS, Dana. 



Carapax multis lineis transversim notatus, subquadratus, lateribus rectis, 

 sive parallel is sive postice convergentibus. Frons dimidio latitudinis 

 carapacis longior. Antennae externce sub fronte saipius exsertce. Tarsi 

 armati. 



Carapax crossed transversely by numerous raised lines, subquadrate, 

 sides straight, often convergent backwards. Front longer than half 

 the breadth of the carapax. Outer antennas usually exsert from 

 beneath the front. Tarsi -armed with spinules. 



The remarks on page 330 render farther explanations unnecessary. 

 We only add, that while the Grapsi live mostly about the rocks in 

 the surf, the Goniograpsi are found to some extent about salt marshes, 

 as well as in shallow and deep waters. 



GONIOGRAPSUS CRUENTATUS. 

 Plate 21, fig. 7, male, natural size. 

 Rio Janeiro, in salt marshes. 



