CLASSinCATION OF THE MAIOID CRUSTACEA. 647 



joint more or less flattened, and dilated toward its distal cud. 

 Type Salimits auritias, Latreille. 



This genus establishes a transition to the Maiidse. 



Amathia, Eoux. Carapace subtriangular, spiuose. jNo spines 

 above the eye. Anterior legs of moderate size. Ambulatory 

 legs slender and cylindrical, penultimate joint not dilated. Type 

 AmatMa Sissoana, E-oux. 



Choeinus, Leach. Carapace elongated, convex, without lateral 

 marginal spines. A prominent prseocular spine. Eyes very small. 

 Merus joint of the outer maxillipedes not auriculated. Anterior 

 legs in the male greatly elongated. Ambulatory legs of the first 

 pair much elongated, of the last three pairs short. Type Ghorinus 

 her OS (Herbst). 



Maceogheiea, De Haan. Carapace triangular. Prseocular 

 spine small. Basal antenna! joint very small, not reaching the 

 front. Merus joint of the outer maxillipedes elongated, and 

 rounded at its distal end (as in Camposcia and Inachus). Legs 

 vei-y long. Type Mcicrocheira Kdrnpferi, De Haan. 



1.^^TMrd joint of the outer maxillipedes notched at its distal end. 



, IJEIOHOPLATUS, A. M.-Edimvds. Carapace subtriangular. 

 E-ostrum bifid, its spines divergent. Basal joint of antennae rather 

 robiist. Anterior legs in male long and slender. Ambulatory 

 legs with the penultimate joint dilated and square-truncated as 

 in Acanthonyx. Tj-^e'Sfrichoijlatiis Suttoni, A. M.-Edwards. 



This genus establishes the transition from the present subfamily 

 to the Acanthonychinse. The single species was contemporaneougly 

 described by me as Halimiis Hectori, from an imperfect specimen. 



Subfamily 3. Acanthonychin^. (See Plate XIT. figs. 5, 6.) (Mdiens 

 phanerophthalmes, M.-Edw., part. ; Acanthonychidce, Stimpson.) 



Eyes small and immobile or partially retractile, and concealed beneath 

 the prominent prseocular spine. Basal antennal joint usually enlarged at 

 base and narrowing distally. Postocular spine small or absent. 



The carapace is usually more or less oblong and flattened, more rarely 

 elongated and subej'lindrical or subtriangular. Rostrum simple or bifid. 

 The merus joint of the outer maxillipedes is truncated at its distal end, and 

 articulated with the next joint at its antero-internal angle. The anterior 

 legs in the male usually have the palm compressed. The ambulatory legs 

 are of moderate length. Postabdomen 4- to 7-jointed. 



