58 



ZOOLOGY OF THE VOYAGE OF THE BEAGLE. 



inner toe of the fore foot with a distinct, pointed claw ; claws rather large, 

 those of the fore feet but slightly arched. Fur rather long, and moderately 

 soft ; general tint of the upper parts of the body, brown, of the sides of the 

 head and body, grayish, but with a yellow wash ; the lower part of the sides 

 of the body and of the cheeks, the tip of the muzzle, and the whole of the 

 under parts, white ; feet dirty white ; ears densely clothed with short hairs, 

 those on the inner side chiefly of an ashy-brown colour, and those on the 

 outer side dusky ; the hairs of the back are of a deep lead colour at the base, 

 black at the tip, and annulated with yellow near the tip ; the longer hairs, 

 which are thickly interspersed, are totally black ; on the under parts of the 

 body the hairs are gray at the base, and broadly tipped with white ; the upper 

 surface of the muzzle is blackish ; the moustaches are black ; the incisors 

 are yellow. 



Length from nose to the root of tail 



of tail 



from nose to ears 



In. Lines. 



6 9 

 5 4 

 1 8 



Length of tarsus (claws included) 



In. Lines 



] G 



of ear 







i 



Habitat, Maldonado, La Plata (June.) 



* 



This species is about the size of Mus Rattus, but is stouter in its proportions ; 

 as in Mus nasutus, the thumb is furnished with a pointed claw. The molars of the 



lower jaw are figured in Plate 34, fig. 1 1, a. 



" This rat was caught in so wet a place amongst the flags bordering a lake, 

 that it must certainly be partly aquatic in its habits. 



?? 



D. 



21. Mus Braziliensis. 



Plate XIX. 



Rat du Brezil, Geoff. 



M. supra fuscus fulvo lavatus ; later ibus capitis corporisque cequb ac abdomine auratis; 

 guld pectoreque albis ; pedibus pilis sordidb Jlavis tectis ; auribus parvulis ; caudd 

 caput corpusque fere cequante ; vellere longo, molli. 



Description. — Head somewhat arched, and rather short ; ears small ; tail about 

 equal in length to the head and body, measured in a straight line; tarsi 

 large. Fur long, and rather soft ; general colour deep golden yellow : on 

 the upper surface of the head and the back, long glossy black hairs are 

 thickly interspersed, and produce, with the admixture of the deep golden 



