new Australian Murida?. 609 



of TJutomys. Supraorbital edges square, neither rounded 

 nor ridged. Palatal foramina long and narrow. Incisors 

 slender, more so than in Ps. nanus. Molars light and 

 delicate. 



Dimensions of the type (measured in skin) : — 



Head and body 113 mm. ; tail 129 ; hind foot (wet 26) ; 

 ear (wet) 21. 



Skull : greatest length 30 ; zygomatic breadth 15 ; nasals 

 12; interorbital breadth 4; breadth of brain-case 13"7; 

 palatilar length 13'3 ; palatal foramina 6*6; upper molar 

 series 4 - 8. 



Ilab. Shark's Bay, Western Australia. Type from 

 Peron's Peninsula ; a picked-up skull from Bernier Island 

 [Shortridqe). 



Type. Old female. B.M. no. 58. 12. 27. 14. Collected by 

 Dr. F. M. Rayner during the voyage of the ' Herald ' ; pre- 

 sented by the Admiralty. 



This pretty mouse has a superficial resemblance to 

 Ps. albocinereus (which has a local subspecies on Shark's 

 Bay — Ps. a. squalorum) , but is really more nearly related to 

 the Ps. nanus group. It is readily distinguishable by its 

 pale colour and long bicolor tail. 



During the Balston exploration of W. Australia, Mr. Short- 

 ridge picked up a dried skull of Ps. prwconis on Bernier 

 Island, but he thought that the animal had become extinct 

 there. The type was obtained during the historic voyage of 

 the ' Herald ' in 1858. 



Pseudomys (Gyomys) glaucus, sp. n. 



A large eastern representative of Ps. albocinenus. 



Size largest of the subgenus. Fur soft and fine ; hairs of 

 back about 11-12 mm. in length. General colour pale blue- 

 grey, not so pale as in albocinereus ; under surface paler grey, 

 the bases of the hairs slaty, their tips greyish white. Ears 

 of medium length, greyish. Hands and feet silvery white ; 

 last hind sole-pad small, round. Tail rather longer than head 

 and body, pale brown above, white on the sides and below. 



Skull in general characters quite like that of Ps. albo- 

 cinereus, but larger and more robust throughout. Anterior 

 zygomatic plate more projected forward. 



Dimensions of the t} r pe (measured on the spirit speci- 

 men) : — 



Head and body 93 mm.; tail 111; hind foot 22 - 5 ; 

 ear 3 8. 



Skull : greatest length 29 ; basilar length 22*5 ; zygo- 



