AUSTRALIAN MALACOSTRACA. 31 



Genus Lambrus, Leach. 



Carapace equilaterally triangular, with the regions convex, 

 tuberculated. Basal antennal joint short and not reaching to 

 the front, the inner orbital hiatus usually occupied by the second 

 joint, which is longer than, or as long as the first. Anterior 

 legs with a tuberculated or spinose crest along the upper margin 

 of the palm. Anterior legs usually very long. Ambulatory legs 

 very short, smooth or minutely spinose. 



i'J. Lambrus longimanus. ? 



(Cancer longimanus, female, Linn. Mils. Lud. Ulr., p. Ill 

 (1764) ; Syst. Nat. p. 1017 (1766). 



Lambrus longimanus, Leach, Linn. Trans., t. ii., p. 310 ; 

 Lesmarest, Cons., p. 85 ; Milne-Edwards, Hist. Nat. Crust., 

 tome i., p. 351 (1834); Miers,- Ann. and Mag. Nat. Hist. 

 (5th series) Vol. iv., Xo. 19, p. 120 (1879). 



Carapace depressed, much broader than long, with shallow 

 concave interspaces between the regions, and covered witli small 

 conical acute tubercles ; the spines of the lateral margins are 

 conical and scarcely longer than those of the surface of the 

 body. Rostrum very small, acute, with a spine on. each side of 

 the median one ; inter-ocular space smooth, concave. Anterior 

 legs greatly elongated ; arm spinulose above and on its anterior 

 margin ; on the posterior margin are seven longer spines, 

 alternating with smaller ones. AVrist minutely tuberculated 

 above, with six or seven alternately larger and smaller spines on 

 its posterior margin ; hand spinulose or tuberculate above, its 

 anterior margin with fifteen to eighteen compound or branching 

 spines, which increase in size towards the distal extremity ; 

 posterior margin with five to eight longer, alternating with 

 smaller spines ; under surface of arm and wrist nearly smooth, 

 of hand minutely granulated or tuberculate. Spinules of the 

 merus joints of the ambulatory legs very small. Penultimate 

 joint of the post-abdomen of the male armed with a spine or 

 tubercle. [Miers.~\ 



Torres Straits ; Port Denison. A widely distributed species. 



