6^6 



MB. E. J. MIEES 0:S THE 



comj^ressed, the fifth somewhat raised upon the dorsal surface. 

 Type Oncinopus aranca, De Haan. 



This curious genus in the form of the basal antennal joint comes 

 nearest Macroclieira, and also has some affinity with the Grrapsoid 

 genus Elamene and its allies. In the subdorsally elevated fifth 

 ambulatory legs it approaches the Maioid Anomura. 



§§ nostrum simple. 



*Inachoides, Milne-Edwards (XipJius, Eydoux & Souleyet). 

 Carapace triangular, with the regions well defined. No pr^cocular 

 spine. Postocular well developed. Anterior legs with the ])alm 

 inflated. Ambulatory legs very slender, with the dactyli straight. 

 Type Imclioides microrhynclius, M.-Edw. & Lucas. 



§§§ Mosfnm long, tivo-spined. 

 * Spines of rostrum con tiguous ivith one another. 



EuRTPODius, Guerin-Meneville. Spines of rostrum rather 

 stout, narrowing to distal extremity. Ambulatory legs very long, 

 with the penultimate joint dilated and compressed. Type Eury- 

 yodius Latreilleif Guerin. 



Oeegonia, Dana. (Plate XII. figs. 3, 4.) Carapace flattened, 

 not spinose. Spines of rostrum very slender. Ambulatory legs 

 of moderate length, very slender, with the penultimate joint simi- 

 lar to the preceding, not dilated and compressed. Type Oregonia 

 gracilis, Dana. 



Pleistacantiia, liters. Carapace convex, spinose. Spines 

 of rostrum long, divergent at their tips. Anterior legs in male 

 elongated. Ambulatory legs very slender and very long, penul- 

 timate joint not dilated and compressed. Type I^leistacantha 

 sancti-johannis, Miers. 



** Spines of rostrum divergent. 



1. Third joint of outer onascillipedes not emarginate at its distal end. 



Halimtjs, Latreille. Carapace sub triangular, Avith lateral mar- 

 ginal spines. Three spines above the eye. Merus joint of the 

 outer maxillipedes somewhat auriculated and produced at its 

 antero-external angle. Anterior legs in male enlarged, palm 

 slightly compressed. Ambulatory legs with the penultimate 



