IlOllN EXPEDITION-MURID.E. 
403 
Skull. 
B $ 
Greatest length - - - 
- 
34-5 
Basal length 
- 
310 
Greatest breadth 
- 
19-6 
Nasals, length . - - 
- 
11-8 
Nasals, greatest breadth 
- 
3-3 
Interorbital breadth 
- 
4-7 
Interparietal length 
- 
5*1 
Interparietal breadth 
- 
10-4 
Brain-case breadth 
- 
15-0 
Anterior-zygoma root 
- 
4-4 
Diastema - - - - 
- 
90 
Palate, length - - - 
- 
18-4 
Anterior palatina foramina 
- 
7-2 
Upper molars length 
- 
71 
Lower molars length 
- 
6-8 
Condyle to incisor tip 
- 
23-5 
Coronoid tip to angle 
- 
100 
Habitat .—Alice Springs, Central Austi’alia, June, 1895. 
It will be noticed that the dimensions are almost identical with Collett’s 
example “ A.” The only apparent discrepancy lies in the fact that the inter¬ 
parietal length above given is the anterior-posterior dimension, whereas Collett 
gives the greatest measurement as the length. My measurement of the inter¬ 
parietal breadth is therefore across the skull. The greatest length of the bulla is 
8’7 mm., or about 4 in the length of the skull. 
Mus fieldi,* sp. nov. Fig. 4, d—j. 
Size medium, fur of moderate length, remarkaldy fine and HuHy; general 
color warm sandy-brown ) head a little darker ; the hairs are dark grey at the 
* At the request of Prof. Spencer I have pleasure in associating with this animal the name of Mr. J. Field, in 
recognition of his valuable services in the collection of certain of the material dealt with in this article. 
*d2 
