34 



Christmas Island. 



FOTES ON THE OSTEOLOCxY OF MUS NATIVITATIS 



AXD MUS MACLEARI. 



By Dr. C. I. Foestth Major, F.Z.8. 



(PLATE II, h\s.) 



Etpn if it were not known that Ilus nativitatis is terrestrial and 



bun'owing, while 3Ius macleari is arboreal, the examination of the 



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



the antebrachium, the carpals, metacarpals, and proximal phalanges 



t 



Fig. 1. — Antebrachium and carpus of Mtis macleari. 

 Fig. 2. — Antebrachium and carpus of Mhs nativitatis. 



R, radius ; U, ulna ; r, radiale ; ?<, ulnare ; 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. 



