48 



ZOOLOGY OF THE VOYAGE OF THE BEAGLE 



Length from nose to root of tail 



of tail 



from nose to ear 



In. 

 4 



Lines. 



3 



Length of tarsus 



4 



2 



of ear 



1 



OA 





In. Lines 

 1 1 



5 



Habitat, Port Famine, Strait of Magellan. 



Musculus 



tion ; the tarsi much longer; the ears are not quite so large in proportion to the 

 head, (which greatly exceeds that of Mus Musculus in size,) and they are densely 

 clothed with hair. The fur is longer. In colour, the animal here described is 

 rather darker than the common mouse. I have one specimen however before me 



which very nearly agrees in this respect. 



The dentition is figured in Plate 34, figs. 6, a. and 6, b. 



From the attention which Mr. Darwin bestowed upon the Muridae of the 

 southern parts of South America, I presume his collection affords materials for a 

 tolerably complete monograph of the species of that portion of the globe. The 

 species above described, however, does not occur in Mr. Darwin's collection, but 

 is here introduced in order to make the work more complete, and that I might 

 more clearly point out the distinctions which exist between it and other 

 species here described, the account given by Mr. Bennett in the Proceedings 

 being very short. 



MUS ARENICOLA. 



- 



Plate XIII. 



Mus arenicola, WaterL, Proceedings of the Zoological Society of London, for February 1837, p. 18. 



31. supra fuscus, subtiis cinerescenti-albus, pallidb flavo tinctus ; auribus mediocribus 

 rotundatis, pilis flavis fuscisqne obsitis ; caudli quoad longitudinem corpus aquante; 

 pedibus cinerescenti-albis : tarsis mediocribus. 



Description.— Fur long, moderately soft ; general colour deep brown ; sides of 

 the body with a very obscure yellowish hue ; under parts dirty gray with a 

 faint yellow tint. All the fur deep gray at the base ; the hairs of the upper 

 part of the body obscurely annulated with yellowish brown near the apex, 

 and dusky at the apex ; the longer hairs are black. Feet brownish, covered 

 above with brown- white hairs; tarsi short. Tail short, blackish above, 

 brown-white beneath. Ears small, well clothed with hairs; those on the 



