AUSTRALIAN MALACOSTRACA. 79 



margin of the buccal cavity separated by a transverse groove 

 from the posterior margin of the antennary region. Anterior 

 legs short and robust ; hand without longitudinal ridges. 



134. Scylla serrata. A.M. 



Cancer serratus, Forskal. 



Cancer olivaceus, Herbst, Krabben u. Tvrebse, ii., p. 157, 

 pi. xxxviii., fig. 3 (1796), 



Portunus tranquebaricus, Fabr., Ent. Syst., Suppl., p. 3GG 

 (1798). 



Lxipea iranqucbarica, M.-Edw., Hist. Nat. Crust., i., p. 418 

 (1834). 



Lupea lolifrons, M.-Edw., Hist. Nat. Crust., i., p. 453 (1831). 



Scylla serrata, De Haan, Faun. Japon., Crust., p. 44 (1834). 



Scylla tranquebarica, Dana, U.S. Explor. Exped. xiii., Crust., 

 part i., p. 270 (1852). 



Scylla serrata, A. M.-Edw., Ann. Sci. Nat., xiv., (4) p. 252, 

 pi. i., ii. (1SG0) ; Nouv. Arch, du Mus., x., p. 319 (18G1) ; 

 Miers, Cat. Crust. N.Z., p. 27 (1876). 



Carapace convex, nearly smooth, very finely granulated ; the 

 lines on the gastric and branchial regions distinct. Latero- 

 anterior margins very long. Front with six large flat teeth. 

 Anterior legs very robust, arm trigonous, with three spines upon 

 the anterior, and two upon the posterior margin. Wrist with 

 an acute spine at its antero-internal angle, and two small spines 

 upon its external surface. Hand very large, with three spines 

 above, two above the base of the mobile finger, and one over 

 the articulation with the wrist, Colour olive brown. 



Port Jackson ; Port Denisou, etc. A species of very wide 

 range, much used for food. 



*&^5 



Genus Thalamita, Latreille. 



Carapace almost quadrilateral and very wide. Frontal margin 

 very broad, occupying with the orbits nearly the whole width of 

 the carapace. Latero-anterior margins forming nearly a right 

 angle with the front, with only four or five teeth. Basal joint 

 of the external antennae very large, flagellum excluded from the 



