244 
THE MAMMALS OE E&TPT. 
Measurements of skulls. 
Greatest length (premaxillse to oecipital condyles) 
,, breadth (zygomata). 
„ ,, (mastoids). 
Interorbital breadth. 
Temporal constriction. 
Basal length. 
Palatal ,, . 
Breadth outside P^s, 1 . 
Alveolar length of P™- ^ 
2. 
imn. 
mm. 
53'5 
51 
35 
31-5 
34 
29-2 
152 
15 
127 
117 
50 
48-2 
26-5 
23 7 
11-5 
11 
20 
20 
6-2 
6 
In I. lihyca the skull from behind the postorbital contraction is triangular in form, 
the brain-case expanding regularly to the outer posterior angle of the parietal, 
i. e. there is no swelling immediately behind the postorbital contraction, the narrowest 
part of the skull occurring here. The region of the skull from the inferior border of 
the occipito-parietal crest to the posterior border of the external auditory meatus is 
much swollen, forming a prominent bullate expansion, a feature which is not found 
in the skull of any other African Ictonyx. Furthermore, the skull of I. lihyca is 
distinguished from that of all other members of the genus by the great development of 
the tympanic bullae, which, as compared with the skulls of the other forms, encroach 
on the mesial line of the base of the skull, greatly reducing the extent of the exposed 
area of the basioccipital and basisphenoid bones, and this narrowing affects also the 
formation of the posterior portion of the mesopterygoid fossa, the pterygoids being 
much closer together than in the skulls of other species. 
[This species has not been authoritatively recorded in the Valley of the Nile to the 
south of the First Cataract. Ic ranges into Tunisia. The specimen obtained by 
Hedenborg, which Sundevall described under the name of I.frenata, is supposed to 
have come from “Sennaar.” Information is required as to the distribution of this and 
of the foregoing species.—W. E. de W.] 
