438 
of the head. A blood vessel, but no bony canal, goes between the crura 
of the stapes. 
The ossicles of Arviacanthis are of a somewhat generalised murine 
type, but very distinctly murine. The resemblance to Hydromys 
chrysogaster, as figured by Doran, is quite close. So far as the ossicles 
go, one would associate the Hydromyinae with the Murinae, and cer- 
tainly not put the Gerbillinae between. 
Fig. 6. Arviacanthis. 6430. 
Fig. 9. Malleus of Tatera. Athi Plains. 
Fig. 9a. Malleus of Tatera. 
Fig. 9b. Incus of Tatera. Athi Plains. 
Tatera sp. (figs. 9, 9a, 9b). 
From owl pellet; Athi Plains, British E. Africa. 
The malleus is peculiar for the form of the head, as shown in the 
figure; but especially for the fact that the processus gracilis traverses 
