848 MRS. E. W. SEXTON OX AMPIilPODA [NoA'. 23, 



Other Central-Australian mammals most probably occur in the 

 Spinifex country of the far interior of Australia. Antechinomys 

 spenceri has been obtained from Central South Australia. A 

 small jumping pouched mouse, said to exist in the rocky hills 

 round Laverton, might be referable to this species. 



Tachyglossus aculeatus ixeptus Thos. (Text-fig. 277, p. 847.) 



Widely distributed ovei' Western Australia except in the 

 extreme south-west ; recorded from Kojonup, but seldom seeming 

 to extend south of the rocky countiy around Yoi-k and Bevei-ley. 

 Although nowhere plentiful it appears to be more numerous in 

 the North- West than elsewhere. 



Generally frequenting diy and rocky situations. Sluggish in its 

 movements, curling up like a hedgehog if irritated. Apparently 

 a great wanderer, often turning up in districts where it has 

 seldom if eA'er been observed before, even by natives. 



Although the claws are very powerful and well adapted for 

 digging, they seem to be used chiefly for tearing up anthills, and 

 the animal does not seem to be truly fossorial ; but when distui-bed 

 in sandy country it is said to be able to bury itself underground 

 like a mole, quickly disappearing from sight, while if the country 

 happens to be hard or rocky, it will cling to the surface so tightly 

 that it is quite difficult to dislodge it. If placed in water it is a 

 quick and powerful swimmer. 



Doubtfully described from Barrow Island. 



5 specimens collected. Southei-n Ci'oss (Parker's Range) ; Gas- 

 coyne River. 



Native Porcupine of Colonists. 



' Kingan ' (S.W.), ' Bokaboi ' (N.W.), of natives. 



2. Notes on some Amphipoda from the North Side of the 

 Bay of Biscay. Families Plettstid^ and Eusmm^. 

 By E. W. Sexton *. 



[Received September 20, 1909.] 



(Plates LXXX. k. LXXXI.t, and Text-figures 278 & 279.) 



I am indebted to Dr. Allen for the opportunity of examining 

 the collection of Amphipoda taken by the S.S. ' Hvixley ' from the 

 north side of the Bay of Biscay in August, 1906 ; and for specimens 

 most kindly sent me for comparison I have to thank Dr. Hansen, 

 Professor )Sars, Dr. Scharff and the Trustees of the Dublin 

 Museum, Mr. Tattersall, and Dr. Vanhoflen. 



Variations due to Sex and Age. 



The collection, though small, proved of great interest. 



In some species several stages of development were found, 



* Communicated by Dr. W. T. Calman, F.Z.S. 

 t For explanation of the Plates see p. 878. 



