442 ON THE AUSTRALIAN BRACHYURA OXYRHYNCHA. 



Genus Hyastenus, White. 



27. Hyastenus diacanthus, Be Haan. fsp.J 



Pisa (Naxia) diacantha, De Haan, Crust. Jap., p. 86, pi. xxiv., fig. 1 (1839); 

 Hyastenus diacanthus, A. Milne- Edivards, Nouv. Arch, du Mus., t. viii,, 

 p. 250; Miers, Cat. Crust. N. Z., p. 9 (1876). Hyastenus verreauxii. 

 A. Milne- JEdwards, Nouv. Arch, du Mus., t. viii., p. 250. 



Hah. Japan (De Haan) ; New Zealand (Brit. Mus.) ; Port 

 Jackson ; Port Denison ; Port Darwin ; Torres Straits. 



This species varies to a remarkable extent in the length and 

 degree of divergence of the rostral cornua, and the length of the 

 second pair of legs. The specimens from Port Denison are much 

 smaller than those from Port Jackson and have the rostral cornua 

 relatively shorter and stouter ; those from Torres Straits are still 

 smaller (7 lines in length) and have the surface of the carapace 

 (in the dried condition) smooth and pearly. 



28. Hyastenus oryx, A. Milne-Edwards. 



Hyastenus oryx, A. Milne- JEdwards, Nouv. Arch, due Mus., t. viii,, p. 250, 

 pi. xiv., fig. 1. 



Sab. New Caledonia (Paris Museum) ; Darnley Island, Torres 

 Straits (" Chevert" Expedition) ; Port Denison. 



Genus Naxia, Milne-Edwards. 



29. Naxia, serpulifera, Milne-Edwards. 



Pisa serpulifera, Guerin, Icon. Crust., p. viii., fig. 2. Naxia serpulifera, 

 Milne-JSdivards, Hist. Nat. Crust., t. i., p. 313. 



Had. New Holland (Paris Museum) ; Port Essington (Macleay 

 Museum). 



Genus Chlorinoides, f novum J. 



Carapace sub-triangular, armed with long spines. Eostrum 

 consisting of two long, slender, divergent cornua. Eyes retractile ; 

 orbits well-defined, open below, with two fissures above. A long 



