437 
vegicus, the malleus is easily separated by the two tubercles (instead of 
only one) on the head above. The manubrium is similar to that of E. 
norvegicus. The stapedial process of the incus, as in E. norvegicus, is 
very large and broad; its outer surface is hollowed. 
Lophuromys sp. (figs. 8, 8a). 
Mt. Kenia, British E. Africa (E. A. Mearns). ©. sept. 29. U.S. 
N. M. 163 526. 
The malleus is very peculiar, almost dagger-like, with a high handle- 
like head; the manubrium, while of ordinary shape, though rather short, 
is of similar consistency throughout, without the strong marginal ribs 
seen in Epimys; in the figure the manubrium appears very broad, but 
it is flat, and in one view looks like a slender rod; the lamina is rather 
Fig. 8. 
Fig. 8a. 
Fig. 8. Malleus of Lophuromys. 
Fig. 8a. Incus of Lophuromys. Two views. 
broad, but with its supporting processus so twisted that it seems to be 
absent when the ossicle is placed in the usual position; the figure shows 
this structure too short and blunt, the extreme tip being apparently lost. 
The malleus of Lophuromys reminds one of that of Geomys bur- 
sarvus, as figured by Doran, but it differs in the greater development of 
the lateral processes. 
The incus of Lophuromys is peculiar; when placed so that the 
stapedial process is directed upwards, the upper or articular side appears 
strongly bifid, as shown in the figure. 
Arviacanthis sp. (fig. 6). 
Nguasso Nyiro, British East Africa (J. A. Loring). Gt. June 26. 
1909. U.S. N. M. 162636. 
The drawings show the ossicles in situ. It is interesting to com- 
pare them with the ossicles of the human ear, and note the extreme bre- 
vity, in comparison, of the stapedial process of the incus, which falls 
far short of the base of the manubrium. In the stapes, the stapedius 
muscle is inserted in the base of the posterior crus instead of in the side 
