BY THE LATE F. E. GRANT AND ALLAN R. McCULLOCH. 153 



OZIUS TRUNCATUS M.Edw. 

 1837. H. Milne Edwards, Hist. Nat. Crust, i. p.406, pl.xvi. fig.ll. 

 Common (Liddell, Laing). 



Plagusia dentipes De Haan. 



1835. De Haan, Faun. Japon., Crust, p.58, pl.viii. fig.l. 

 1878. Miers, Ann. it Mag. Nat. Hist. (5) i. p.l52. 



This species differs from P. capensis De Haan { = P. chahrus 

 Aud.) so common on the Australian coast in the following 

 particulars : — 



The lower distal end of the merus of the legs is armed with a 

 spine and not rounded. There is a group of granules on the 

 hepatic regions. There are three or four dentiform processes on 

 the front, the hindermost being the largest, while in P. capensis 

 each lobe presents a row of six to seven granules. The teeth on 

 the ambulatory legs are stronger, the hairs on the dorsum of the 

 carapace are shorter and do not in the adult cover the branchial 

 prominences. 



In P. dentipes rudimentary exopods are also developed on the 

 ambulatory legs. 



Common (Liddell, Laing). The species is also common on Lord 

 Howe Island. 



Percnon planissimum (Herbst.). 



1900. Leiolophus planissimus Alcock, Journ. Asiatic Soc. Bengal, 



Ixix. p. 439. 

 1906. Rathbun, U. S. Fish Commission, Bulletin, 1903, p.842. 

 Common (Liddell). 



Hymenosoma lacustris Chilton. 



1882. Elamena (?) lacustris Chilton, Trans. N. Z. Inst. xiv. p. 17 2, 



pl.viii. 

 1902. Fulton & Grant, Proc. Roy. Soc. Vict. xv.(N.S.) p. 5 9, pl.viii. 

 Common (Laing). A freshwater species inhabiting rocky pools 

 It has also been recorded from New Zealand and Victoria. ..■: 



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