w 



ZOOLOGY OF THE VOYAGE OF THE BEAGLE. 





Length from nose to root of tail 



of tail 

 from nose to ear 



In. Lines 



6 

 4 9 

 1 3 





Length of tarsus (claws included) , 



of ear . 



In. Lines. 

 1 2 



7 



Habitat, Chatham Island, Galapagos Archipelago, Pacific Ocean, {October.) 



Mx 



s Rattus. The upper parts of the body have a 



slightly variegated appearance. 



The skull of Mus Galapagoensis (Plate 33, fig. 8, a,) is rather smaller than 

 that of M. Rattus, the nasal portion is proportionately longer, the cranial 

 shorter, and the interparietal bone is smaller, especially in anteroposterior 

 extent; its length is 15 lines, and its breadth is 8£ lines. The lower jaw is 



figured in Plate 34, fig. 14, a. Fig. 8, b, of Plate 33, represents the molars of the 

 upper jaw, and fig. 8, c, those of the lower jaw. 



" This mouse or rat is abundant in Chatham Island, one of the Galapagos 

 Archipelago. I could not find it on any other island of the group. It frequents 

 the bushes, which sparingly cover the rugged streams of basaltic lava, near the 

 coast, where there is no fresh water, and where the land is extremely sterile/'— D. 



27. Mus Fuscipes. 



Plate XXV. 



fi 



fi 



auribus mediocribus, 



fi 



Description.— Form stout ; ears moderate ; tail equal to the body in length ; 

 tarsi moderate ; fur very long. General tint of the upper part and sides of 

 the head and body blackish brown with an admixture of gray ; of the under 

 parts grayish white ; feet brown, the hairs grayish at the tip : tail black and 

 but sparingly clothed with short bristly hairs : ears rather sparingly clothed 

 with hairs, which are for the most part of a brownish gray colour. The ordi- 

 nary fur of the back is about § of an inch in length and very soft— of a deep 

 gray colour, broadly annulated with hrownish yellow near the tip and blackish 

 at the tip : the longer hairs which are black, measure upwards of \\ inches 

 in length. The upper incisors are of an orange colour and the lower are 



black. 



Length from nose to root of tail 



of tail 

 from nose to ear 



In. Lines 



6 6 

 4 3 

 1 6 



Length of ear 



of tarsus (claws included) 



In. Lines 



1 1 







Habitat, Australia, King George's Sound, {March.) 



