306 CRUSTACEA. 



inner angle deeply truncate; in length, about half the second. Abdo- 

 men hirsute. Hand short; fingers a little incurved, inner margin 

 denticulate. Tarsus of following legs slender tapering, and nearly as 

 long as two preceding joints, which two are subequal in length. 



IV. CRUSTACEA GRAPSOIDEA. 



The Grapsoidea correspond nearly to the Catometopa of Edwards. 

 The Telphusa group is excluded, as having somewhat closer affinities 

 with the Cancroidea. 



In subdividing the Grapsoidea, we first observe a number of species 

 in which the outer maxillipeds have a Cancroid character — the fourth 

 joint articulated with the inner apex of the third joint— and which thus 

 are unlike the great majority of the Grapsoidea, These may be con- 

 sidered as forming the transition to the Cancroidea ; among them, the 

 genus Eucrate has much the form of Pilumnus or Panopams. 



This group, the Gonoplacid.e, is different from that of other authors 

 so called, in that the Macrophthalmi and related species are not in- 

 cluded, as is evidently required by their characters. 



The remaining Grapsoidea constitute naturally five families. One 

 group has near relations to the Gonoplacidae and Podophihalmidae j it 

 is the Macrophthalmid^e, under which are embraced, (1) Maeroph- 

 thalmus and the related genus Cleistostoma ; ('J) Ocypoda and Gelasi- 

 mus; and (3) Doto, making three subfamilies. The long eyes, narrow 

 front, narrow male abdomen, as well as similarity of general form, 

 even to the acute anterior angles of the carapax, require this union of 

 the species; while the transverse or longitudinal position of the inner 

 antennae separates the Macrophthalminae and Oeypodiiuc, and the 

 concealed termination of the outer maxillipeds, characterizes the 

 Dotinaa. 



The next family is the Grapsid.e. They have shorter eyes and a 

 longer front than the Macrophthalmi die, a more depressed form, with 



