EXPLANATION OF PLATES. 



The skulls illustrated in these jalates were all photographed natural size. The 

 scale as given is in most cases correct, but allowance should be made for very slight 

 variations from the size of the actual specimens which sometimes exist in plates 

 made by the photographic i^rocess. 



Plate 1. 



Map of Eastern Equatorial Africa. 



Plate 2. 



East African maned rat (Lophiomys ibeanus) photographed from living specimen in 

 the National Zoological Park. (From Baker, Smithsonian Misc. Coll., vol. 59, No. 9, 

 pi. 1, 1912.) Much reduced. 



Plate 3. 



Skulls of Pedetes, lateral view, natural size. 



Upper figure. Pedetes surdaster surdaster. Adult female; Cat. No. 162170; Naivasha 

 Station, British East Africa. 



Lower figure. Pedetes surdaster larvalis. Adult female; Cat. No. 163304; Ulukenia 

 Hills, British East Africa. Type-specimen. 



Plate 4. 



Skulls of Pedetes, dorsal view, natural size. 



Upper figure. Pedetes surdaster surdaster. Adult female; Cat. No. 162170; Naivasha 

 Station, British East Africa. 



Lower figure. Pedetes surdaster larvalis. Adult female; Cat. No. 163304; Uluke- 

 nia Hills, British East Africa. Type-specimen. 



Plate 5. 



Skulls of Pedetes, ventral view, natural size. 



Upper figure. Pedetes surdaster surdaster. Adult female; Cat. No. 162170; Naivasha 

 Station, British East Africa. 



Lower figure. Pedetes surdaster larvalis. Adult female; Cat. No. 163304; Ulukenia 

 Hills, British East Africa. Type-specimen. 



Plate 6. 



Skulls of Eeterocephalus glaber, adult males, from north of Mount Kenia; dorsal 

 and ventral views, natural size. 

 Cat. No. 184174. Longaya Water. 

 Cat. No. 184173. Lakiundu River. 

 Cat. No. 184172. Archer's Post. 

 Cat. No. 184171. Archer's Post. 



Plate 7. 



Skulls of Eeterocephalus glaber, adult females, from north of Mount Kenia; dorsal 

 and ventral views, natural size. 

 Cat. No. 184177. Archer's Post. 

 Cat. No. 184176. Merelle Water. 

 Cat. No. 184175. Merelle Water. 

 Cat. No. 184170. Northern Guaso Nyiro. 



171 



