224 On a new Genus of Crustacea. 
? of the other genus. The following are their characteristics, omit- 
ting the points in which they agree. 
Genus TRapPezia. 
Frons sinuosus vel 6-8-dentatus. 
Mazillipedes externi marginem posticum fere transversi ; apices 
que articulorum secundorum inter sese valde remoti. 
uperficies prelabialis viaque efferens linea elevata divise 
margoque buccalis anticus utrinque emarginatus, emarginatione 
vie efferentis ostio 
Pedes antici elongati, brachio extra carapacem valde exserto, 
margine brachii antico denticulato et apicem anticum acuto, 
manu fere recta, pollice parce deflexo. 
Pedes 8 postici non unguiculati, tarso apicem pusillé producto 
et truncato. 
Abdomen maris szpius 5-articulatum. 
Genus Terratta. 
Frons rectus aut rectiusculus, subtilissimé denticulatus. 
Macillipedes externi marginem posticum valde obliqui, apices 
articulorum secundorum inter sese paulo remoti. 
Superficies prelabialis viaque efferens lined paulo elevata 
divisee sed margo buccalis anticus vix emarginatus, 
Pedes antici breviores, brachio apicem paulo exserto, margine 
brachii antico apicem rotundato subtiliterque denticulato, pollice 
valde deflexo. : 
Pedes 8 postict, breviter unguiculati. 
Abdomen maris 7-articulatum. 
cinatu 
in the ridge separating the efferent canal from the preelabial space 
as well as the narrow form, these genera are related to Eriphia. 
Fuller descriptions with many illustrations will be given in the 
Author’s Report on the Crustacea of the Expedition, now ready 
for the press. a 
