AUSTRALIAN HALACOSTEACA. 41 



61. Carpilius convexus. 



Cancer convexus, Forskiil, Descript. Anim., p. 88. 



Carpilius convexus, Riippell, Crust, de l'Egypte, pi. 3, fig. 2 ; 

 Milne-Edwards, Hist. Nat. Crust., t. i., p. 382, pi. xvi., figs. 9 et 

 10 ; De Haau, Faun. Japon. Crust., p. 17 ; Dana, U.S. Explor. 

 Exped., Crust., t i., p. 159, pi. vii., fig. 5 ; A. M.-Edw., Nouv. 

 Arch, du Mus., t. i., p, 215. 



Front rather broad and formed of four lobes, of which the 

 two lateral are almost straight, and the two median nearly 

 coalescent and little prominent. Carapace very convex ; hepatic 

 region and anterior portion of the gastric region punctate. 

 Colour yellowish, irregularly spotted with red. 



"Widely distributed in the Pacific and Indian Oceans and 

 Red Sea. 



Crenus Atergatis, De Haan. 



Carapace broad, convex, regions usually indistinct. Front 

 lamellar, not prominent, straight or slightly sinuous. Antero- 

 lateral border longer than the postero-lateral, usually entire, 

 prominent, and sharp. Orbits without an external hiatus. Basal 

 joint of the antennae joined to the front only by its internal 

 angle. Ambulatory legs compressed, surmounted by an acute 

 crest. 



65. Atergatis floridus. A.M. 



Cancer floridus, Humph., D'Amboinische Rariteitenkammer, 

 p. 1(3, pi. viii., fig. 5 ; Linnams, Syst. Nat., xii. ed., p. 1011. 



Cancer oo/roe, Herbst, Krabben u. Krebse, pi. liv., fig. 2 ; 

 M.-Edw., Hist. Nat. Crust., t. i., p. 375. 



Atergatis floridus, De Haan, Fauna Japon., Crust., p. 1(5 ; 

 Dana, U.S. Explor. Exped., Crust, t. i., p. 159, pi. vii., fig. 1 ; 

 A. M.-Edw., Nouv. Arch, du Mus., t. i., p. 213 ; Miers, Ann. 

 and Mag. Nat. Hist., 1880, p. 7. 



Carapace dilated, broad, with regions pretty distinctly indicated. 

 Surface slightly embossed, very finely punctate. Antero-lateral 

 borders lamellar, sharp, terminating behind in a small rounded 

 tooth and presenting one or two minute fissures. External 

 orbital angle distinct from the antero-lateral border. Front 

 much inclined downwards, broad, prominent in the middle, and 



