34 



Christmas Island. 



FOTES ON THE OSTEOLOdY OF MUS NATIVITATIS 

 AXD MUS MACLEARL 



By Dr. C. I. Foesyth Majoe, F.Z.S. 



(PLATE II, his.) . 



Etfjj- if it were not known that 3Im nativitatin is terrestrial and 

 bu} rowing?, while Ihm macleari is arboreal, the examination of the 

 manus of both species woiild reveal this fact at once. The bones of 

 the antebrachinm, the carpals, metacarpals, and proximal phalanges 



rm: 



U 



1. 



Fig. 1. — Antebrachium aud carpus of Mm macleari. 

 Fig. 2. — -Antebrachium and carpus of Mhs nativ'itatis. 



R, radius ; U, ulna ; r, radiale ; u, ulna re ; rm, radiale marginale ; 

 p, pisiforme ; c, centrale ; 1-4, first to fourth carpale ; a, dorsal 

 phalange of first digit ; i-v, first to fifth digit. 



are all slenderer and more elongate in the latter species, stouter 

 and broader in the former, the longitudinal dimensions of the 

 fore-limb as a whole being about the same in both. 



