183 



freely seen. Whiskers moderately long, and dark. Upper 



and lower incisors yellow at the tips, and white at the base. 



Length from tip of nose to root of tail ... 6| 



„ of tail 4^ 



„ from nose to ear If 



„ from nose to eye ... 1^ 



» of ear f^ 



Width of ear § 



Length of fore feet h 



„ of hind feet l} 



Circumference of chest 4| 



Length of skull lA 



Width of skull J 



Length of nasal bones.. 



of palatine bones 



„ of lower jaw l-i% „ 



Comnoid process, curved and acuminate. Condyloid pro- 

 cess, small and narrow, nearly horizontal, with a well 

 marked tubercle near its base. Posterior angle broad and 

 rounded. Descending ramus deeply emarginate. Differs 

 from the genus Mus in having its suj^erior and inferior 

 molars almost crossed by folds of enamel (each fold 

 near its termination widens out and has in its centre a deep 

 depression) and in having no cusps. Incisors long and 

 slender. 

 Habitat. — Long's Plains, from T. B. Moore, Esq. 



Mus Castaneus. — Nov. Sp. ^ 

 Form very robust. Fur very long, dense, and soft ; on 

 the head, back, and sides castaneous, interspersed with longer 

 black hairs ; on the under surface of the body the hair is of 

 a yellowish ash colour ; throat, chin and nose, leaden grey. 

 Fur on the cheeks, excessively long and bushy, giving the 

 appearance of very full whiskers. Ears broad and roundly 

 pointed, covered internally sparsely, and externally thickly 

 with short hairs of the same colour as those on the body. 

 Tail on the upper surface clothed with brown hairs ; on the 

 under surface with hairs of a lighter tint, through which the 

 scales can be seen. Fore and hind feet clothed with leaden 

 grey hairs, which reach to the base of the nails. Whiskers 

 moderately long, dark brown, almost black. Form of head 

 rounded. Upper incisors orange colour 

 yellow. 



Length from tip of nose to root of tail 



„ of tail 



'„ from nose to ear 



» „ to eye 



„ of ear 



Width of ear 



