84 AUSTRALIAN MALA.COSTRACA. 



144. Amphitrite gladiator. 



Portunus gladiator, Fabr., Suppl. ; Latr., Encycl., t. x., 

 p. 189, etc. 



Cancer menestho, Herbst, pi. 1\\, h. 3. 



Lupea gladiator, M.-Eclw., Hist. Xat. Crust., t. i., p. 456. 



Amphitrite gladiator, DeHaan, Faun. Jap., Crust., p. 39, pi. i., 

 fig. 5, and p. 65, pi. xviii., fig. 1. 



Front with six teeth, the two median teeth lower. Lateral 

 teeth acute. Arm quadri-dentate internally, carpus uni-dentate 

 on each side and at the apex. Hand uui-costate internally, 

 quinque-costate externally, transversely plicate below. 



Palm Island. 



Family IV. PLATYOXYCIIIBA1. 



Carapace rarely hexagonal, more or less rounded on the sides, 

 often longer than broad. Teeth of the anterolateral margins 

 well-defined, acute. Inner ramus of the first pair of maxillipedes 

 simple. Abdomen narrow at base. Margin of the efferent 

 branchial channel not defined by a longitudinal ridge on each 

 side of the pre-labial plate or palate. Fifth pair of legs 

 natatorial, their terminal joint oval, expanded, and lamellate. 



Genus Platyontchus, Latr. 



Carapace broader than long, smooth above, antero-lateral 

 margins regularly five-toothed. Front narrow, dentate, not 

 produced. Orbits wide, with a large internal hiatus. Anterior 

 legs large, the hands long, costate externally. Next three pairs 

 of legs with the tarsi lanceolate, compressed. 



145. Platyonychus bipustulatus. A.M. 



Platyoiii/cJius lipustulatus, M.-Edw., Hist. Nat. Crust., i., 

 p. 437, pl.xvii., figs. 7-10; A. M.-Edw., Nouy. Arch. Ju Mus., 

 x., p. 413; Miers, Zool. "Erebus and Terror," Crust., p. 2, pi. i., 

 fig. 1 (1874) ; Cat. Crust. N.Z., p. 32 (1876). 



Anisopus punctatus, De Haan, Faun. Japon., Crust., p. 44, 

 pi. ii., fig. 1 (1835). 



Plat ijoni/chus purpureas, Dana, U.S. Explor. Exped., Crust., i., 

 p. 291,' pi. xviii., fig. 3 (1852). 



