On a Collection of Mammals from Central and Northern Queensland. 837 



The skull. In tlie four skulls hardly any trace of Variation 

 is visible. 



Size of skull 



Length of dental series 



length 191 mm, breadth 101 mm 



„ 195 „ „ 102 „ 



„ 199 „ „ 105 „ 



„ 203 „ .. 111 ., 



Upper jaw 96 mm , lower jaw 96 mm 

 ,. 96 » „ „ 96 „ 



„ 98 „ „ „ 98 M 



The dentition is normal : — i| ^ { P i wf (42). 



In one specimen (B) the right upper p ' is rudiraentary. 



Ordo Rodentia. 

 Fam. Muridae. 



2. Mus greyi Gray 1841. 



Mus greyi Gbai, App. Gret's Journ. Disc. Austr. Vol. II, p. 410 

 (1841). 



A. CooDQooboolaroo, Dec. 1883 (skin with skull). 



B. Coomooboolaroo, Dec. 1883 (skeleton). 



Two specimens were obtained, which (according to Mr. Thomas) 

 belong to this species. Both were taken in houses, where it appears 

 to take the place of our M. decumanus. When compared with this 

 species, the colour is, however, a more intense reddish brown ; the 

 Upper surface of the feet is reddish-grey, and it is besides considerably 

 smaller. 



The number of rings on the tail were (in A) about 90; in the 

 skeleton the number of caudal vertebrae is 30. 



The skull. The specimens obtained appear to be full-grown, 

 as the teeth already (in A) are rather worn, but less so in the 

 slightly larger specimen B. 



Size of skull. 

 A. length 34 mm, breadth across the zygomatic arches 19 mm 



B. 



35 



In the structure of the skull M. greyi most closely resembles 

 M. rattus, buth the teeth are considerably stronger. As in the last 

 species the orbital crest is already distinct at the front margin of 

 the orbita, and extends, a narrow elevated ridge, backwards to some- 

 what below the lateral angle of the os interparietale; in their hinder 

 portion the crests are low, but every where distinct. In their course 



