776 ON MAMMALS FROM WESTERN AUSTRALIA. [Nov. 13, 



by tlie narrowness of the interoi'bital I'egion, which is only 

 10 mill, across as compared with over 13 nnii. in hernieri, and in 

 this respect the skulls of the latter are I'emai-kably uniform. 



Dimensions of the type, measiu'ed in the skin : — 



Head and body 400 mm ; tail 280 ; hind foot s.u. 109, c.u. 124; 

 ear 43. 



Skull — greatest length 76 mm. ; basal length 66 ; greatest 

 breadth 44; nasals 19xll"5; interorbital breadth 10; length of 

 secator 5. 



JIab. Dorre Island, Shark's Bay. 



Ti/pe. Old male. B.M. No. 0.6.1.18. Original number 93. 

 Collected February 1899 by Mr. J. T. Tunney, and presented by 

 the Western Australian Museum, Perth. 



From true L. hirsuhts the Doia-e Island form difieis in all the 

 characters mentioned above as distinguishing L. k. bernieri, and 

 is of course very closely allied to the latter. 



46. MUS ALBOCINEREUS SQUALORUM, Subsp. n. 



One male, four females. 



Quite like the true J/, albocinereus of the Swan and Avon 



districts in all respects of propoi'tions, colour, and striicture of 



skull, but markedly smaller throughout, as evidenced by the 



following measurements, all taken by Mr. Shoi'tiidge in the 



flesh : — 



J/, a. albocinereus. — Dwaladine, Avon District. 



Head and bodj'. Tail. Hind foot. Ear. 



mm. mm. mm. mm. 



<3 105 115 23 18 



S 105 105 22 18 



2 98 97 22 18 



JI. a. squalorum. 



2 90 88 21 18 



$ 83 82 21 16 



5 80 85 21 16 



The following are the skull-dimensions of the type, followed in 

 brackets by the corresponding dimensions of a rather younger 

 skull of the true M. cdbocinereas : — 



Greatest length 25 (27-5) ; basilar length 18*5 (21) ; greatest 

 breadth 13 (13-7); length of nasals 9-2 (10-2); interorbital 

 breadth 4 (4) ; breadth of brain case 11-6 (12-4) ; palatilar length 

 10-6 (11"7): palatal foramina 4*7 (5'2) ; length of upper molar 

 series 3'6 (3"9). 



The tails of all the specimens are entirely white, not darker 

 above, but this is frequently the case with inland specimens of 

 true cdbocinereus, although the co-types figured by Gould, from 

 the coast near Pertli, both have distinctly darker upper sides. 



Hab. Bernier Island, Shark's Bay. 



Type. Old female. B.M. No. 6.10.5.6. Original number 622, 



