156 DECAPOD CRUSTACEA FROM NORFOLK ISLAND. 



Tribe CARIDEA. 



Alpheus edwardsii Audouin. 



1809. Audouin, Savigny's Descript. de I'Egypt, pl.x. fig.l. 

 Common (Liddell, Laing). 



XiPHOCARis compressa (De Haan). 



1849. E'phyra comjyressa De Haan, Faun. Japon., Crust, p. 186, 



pl.xlvi. fig. 7. 

 1894. Xiphocaris compressa Ortmann, Proc. Acad. Nat. Sci. Philad. 

 p. 400. 



A freshwater species. We have a good series taken on both 

 sides of the island by the Messrs. Laing. 



The variability of the dentition of the rostrum of specimens 

 from Norfolk Island has already been drawn attention to by G. 

 M. Thomson* who also records its occurrence in New South 

 Wales and Victoria. We are indebted to Prof. Chilton for 

 pointing out that those taken from streams on the east side of 

 the divide are smaller in size and with a proportionately shorter 

 ro:strum than those on the west. 



EXPLANATION OF PLATE. 



Plate i. 

 Fig.l. — Eriphia 7iorfolcensis, sp.nov. 

 Fig. la. — Eri2)hia norfolcensis, oral region. 

 Fig. 16. — EHjihia norjolcensis, larger cheliped. 

 Fig, 2. — Pachychehs lifuensis Borradaile. 

 Fig.2a. — Pachychehs lifuensis, external maxilliped. 



1903. Trans. Linn. Soc. London, Vol. viii. p. 449 



