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Zoology. 125 



2. Regio carapacis postica transversim nan convexa- 



a. Caxapax versus marlines frontalem anteroJateralemque curvatim dedivia. 



G. 5. AcT^AjDe Haan^^ Dana. — Margo postero-lateralis brevis, 

 S8?pius concavus. Orbita hiatu exlerno non inlerrupla. 



8. Carapax versus luargines froutakm antero-lateralemque parce declivis. 



a Orbita hiatu externa non interrnpta, 



^ Cr. 6. Xantho, Leach. — Margo antero-laleralis postero-laterall lon- 



H ' g'o^' Articulus antennce externne Imus obloneus, frontem bene 



I altingens, arliculo sequente e apicis medio articuli Imi orto- 



G. 7. EuxANTHus, Dana, — Xanlho forma similis: articulus an- 

 tennce externce Imus hialum ad summum implens, articulo se- 

 quente e latere excavato apicis orto, 

 G. 8, Paraxanthus, Lucas.\ — Xanlho forma similis : articulus 

 antennae externa? Imus abbreviatus processum fronlis oblongum 

 attingens tantum. Abdomen maris 5-articulatum, 

 G. 9. Menippe, De Haan.\ — Margo antero-lateralis poslero-lat- 

 erali brevior. Articulus antennse externse brevis nee frontem 

 nee frontis processum attingens. Abdomen maris 7-articulatum. 



P Orbita hiatu externa interrupta, hifra Integra, 



^ G, 10. PANOPiEus, Edtcards. — Margo antero-lateralis tenuis^ pos- 



tero-laterali ssepius brevior, ad orbitse angulum externum directus. 



4 



7 Orbita infra extusqiic tribus dentibus instrudaj una externa, duabiis inferioribiis. 



G. 11. Med^us, Dana. — Angustus, paulo transversus, [nudus,] 

 fronte sat brevi. Margo antero-laleralis sub orbita productus. 

 Abdomen maris 5-arlicuIalum, segmento ultimo brevi. Pedes 

 antici crassi, ils Xanthi similes. 



G. 12. Halimede, be IIaan.§ — Angustus, parce transversus, [vil- 

 losus,] fronte breviore. Abdomen maris 7-articulatum, seg- 

 mento ultimo valde elongato. Pedes antici crassi, iis Xanthi 

 similes, — An Pilumnis propinquior? 



3. CHLORODIN-^, — Antennae internae transversse. Antenna; externa? 

 ^ basi firme infixte, parte mobili hiatu orbitse raro exclusa. Frons 



inlerorbitalis lalior. Digili instarcochlearis excavati. — Quoad genera, 

 Xanthina) et Chlorodinae ferme parallelse. 



* Faun, Japon. IS. 



t Crust. D'Orb. S. Am., 18. We see no sufBcient character for sustaining this 

 ^^+^' ^^^^P^ing the short basal joint of the outer antenuie. 



t Faun. Jap. '2\,—Pseudocarcinus of Edwards, Crust, i, 4:01 ,— Pelmus, Eydoux and 

 I ooulevet, Voy. de la Bonite. Felaaca amiatus is the name given to a Sandwich 



island species %ured in the plates of the Bonite, but not yet described. 



s Faun. Japon. 35. Our Medieiis has nearly the outline of Halimede, but i? na- 



*ed and very deeply areolate. It is a Xantho in nearly all its characters, though 



Uarrow, and having the orbit below deeply divided. On this account, I liave iiitro- 



uced Halimede, which resembles our genus in form, in this place, not having ha4 



«^ opportunity to study its characters from spticimeus. 



