GRAPSOIDEA. 379 



G. 3. Xenophthalmus, White* — Corpus obesuni, fronte incisionibus duabus pro- 



fundis oculos gerentibus instructo. 

 G. 4. Xanthasia, White.-\ — Corpus depressum, supra fere planum margineque 



elevato utrinque instructum, fronte paulo producto. Oculi normales. 



6. Pedes 4ti longiores et multo validiores. 

 G. 5. Pinnixa, White.\ — Corpus portentose* transversum. 



2. Oculi sat remoti. Fossce antennales septo laiiusculo sejunctce. Articulus maxillipedis externi 

 2dusfere dimidii Ztii longitudine. 



G. 6. Pinnothekelia, Lucas.§ — Pedes 8 postici sat graciles, subsequi. Corpus 

 suborbiculare. 



2. HYMENICINiE. — Corpus ssepius parce rostratum, depressum. 

 Articulus maxillipedis externi 2dus dimidio 3tii major. 



G. 1. Hymenosoma, Leach. — Carapax suborbiculatus, angulo extra-orbitali acuto. 



Frons angustissimus, non lobatus, oculis valde approximatis. 

 G. 2. Halicarcinus, White.\\ — Carapax suborbiculatus, angulo extra-orbitali nullo. 



Frons tridentatus, antennis internis inter derites se porrigentibus, oculis remotio- 



ribus. Articulus maxillipedis externi 3tius 2do paulo major. 

 G. 3. Hymenicus, Dana.^ — Carapax suborbiculatus, angulo extra-orbitali nullo 



aut parvulo. Frons productus, simplex aut lobatus, antennarum basin celans, 



oculis remotioribus. Articulus maxillipedis externi 3tius 2do paulo major. 



Pedes gracillimi. 

 G. 4. Elamena, Echo. — Carapax subtriangulatus, paulo oblongus, paulo rostratus, 



fronte antennas internas celante. Articulus maxillipedis externi 3tius 2do minor. 



Subfamily I. PINNOTHERINiE. 

 The species constituting the subfamily Pinnotherinse are usually 



* White, Ann. Mag. Nat. Hist., xviii. 177, and Voy. of Samarang, p. 63. The genus 

 Fabia forms a transition from Pinnothera to Xenophthalmus; it includes the P. 

 chilensis. 



f Ann. Mag. Nat. Hist., xviii. 176. 



I Ann. Mag. Nat. Hist., xviii. 177. Includes Say's Pinn. cylindricum, Jour. Acad. 

 Nat. Sci. Philad., i. 452. 



§ Crust, of D'Orbigny's S. Amer., p. 24. The genus forms a transition to the Gc- 

 carcinidas. 



|| Ann. Mag. Nat. Hist., xviii. 178. 



if The genus Hymenosoma belongs to the Cape of Good Hope ; Halicarcinus to the 

 extremity of South America, and Hymenicus to New Zealand. 



