439 
the middle of the lamina, as much of the lamina being below it as above. 
The incus is not unlike that of Lophuromys. j 
The head of the malleus suggests that of Arvicola amphibius, as 
figured by Doran. 
Otomys sp. (figs. 10, 10a). 
From owl pellet; Athi Plains, British E. Africa. 
Contrary to expectation, the malleus of this genus has an entirely 
murine appearance, and is close to that of Epimys, though somewhat 
Fig. 10. 
Fig. 10a. 
Fig. 10. Malleus of Otomys sp. Athi Plains. 
Fig. 10a. Incus of Ofomys sp. Athi Plains. 
less specialised. The incus is less like that of Epimys, but not especi- 
ally remarkable in any way. 
Dendromus sp. (fig. 5). 
Mt. Kenia, British E. Africa (J. A. Loring). g'. Oct. 13. 1909. 
U.S. N. M. 164453. 
The malleus is of the same type as that of Hydromys chrysogaster. 
The orbicular apophysis is strongly developed, 
even bulbous. The processus gracilis is rudi- 
mentary, the lower part of the lamina being 
practically without its support; but the pro- 
cessus cephalicusis strong, and directed down- 
wards. 
There is a strong general resemblance 
to the ossicles of Arviacanthis. 
Thamnomys sp. (fig. 7) Fig. 5. Dendromus. 164453. 
Lake Naiwasha, British E. Africa (J. A. Loring). g' July 21. 1909. 
U.S. N. M. 162524. 
