AUSTRALIAN MALACOSTRACA. 71 



Carapace very convex, both in the transverse and the antero- 

 postrior direction, much deflexed in front ; regions well defined ; 

 surface with four transverse granular ridges, one crossing each 

 of the hepatic and epi-branchial regions, and one on each meso- 

 branchial region ; meta-branchial regions granulated laterally. 

 Front granular, very prominent, bilobed, the lobes rounded, and 

 separated by an angular cleft. Orbital margin granular above 

 and with two slight fissures, a deep fissure below the external 

 angle, external to which on the pterygostomial region is a 

 tubercular eminence. Internal orbital angle prominent, denti- 

 form. Antero-lateral borders acute, four-lobed, the first two 

 lobes low and broad, the last two narrower, tooth-like and sub- 

 acute; all margined with granules. Arm with an acute spine 

 above at its distal extremity. Wrist granular, with an acute 

 spine at its antero-internal angle with a low blunt prominence 

 below it. Hand granular, very broad, the right larger than the 

 left ; fingers of the former very stout, the mobile one with two 

 broad teeth, the immobile one with two rounded teeth and a few 

 small tubercles ; fingers of left hand more slender than those of 

 right, and with more numerous and smaller teeth. Ambulatory 

 legs hairy. Length 15/16ths inch ; breadth 1| inch. 



Port Philip ; Port Jackson. Found also in New Zealand. 



The size of the frontal lobes varies much in different 

 individuals. 



Genus Hexapus, De Haan. 



Carapace dilated-quadrate, convex in the middle. Antenna? 

 very short. Anterior legs short and thick. Ambulatory legs 

 only six in number. Abdomen of the male seven-jointed. 



123. Hexapus sexpes. A.M. 



Cancer sexpes, Fabr., Entom. Syst. Suppl., p. 311. 



Hexapus sexpes, De Haan, Faun. Jap., Crust., p. 63, pi. xi., 

 fig. 6 ; A. Milne-Edwards, Nouv. Arch, du Mus., t. ix., 253, 

 pi. xii., fig. 1. 



Carapace very wide ; antero-lateral borders arched, regions 

 indistinct, sides very finely granulated, a granular line extending 

 from the external orbital angle to the base of the last pair of 

 legs. On eaidi side of the buccal orifice are five or six small 



