from the Fayim, Egypt. 99 
The dimensions (in centimetres) of the teeth in the new specimen are: 
Length. Width. 
_ pm. 4 ae a a ia 0) 
m. 1 14 Ss 
m. 2 ey 1°3 
m. 3 2°4 1°5 
(first or second) seems to belong to the large species of Geniohyus, 
G. mayor, and shows that in that also the peculiar structure of the 
mandible existed, though whether to the same degree as in G. mirus 
cannot be determined without more material. The dimensions of the 
molar are: 2°6cm. long, 1-6cm. wide. Unfortunately the structure 
of the skull in this extraordinary animal remains at present quite 
unknown. 
Other specimens of interest are portions of the mandible of Sagha- 
therium magnum, one of which consists of the almost complete left 
ramus (Fig. 2) with the canine premolars and molars well preserved. 
Fic. 2.—Saghatheriwn magnum. Left ramus of mandible, outer side. c¢. canine ; 
cond. condyle ; for. foramen in base of ascending ramus; m. 1-3, molars ; 
pm. 1-4, premolars; sym. symphysis. The lower outline of the angular 
region is taken from an undistorted specimen. 4% nat. size. 
The jaw has been somewhat crushed, in such a way as to diminish its 
depth beneath the hinder molars and in the region of the angle, the 
full depth being shown in the second specimen, the outline of which 
is shown in the figure. On the whole, this mandible agrees very 
closely with that of the recent Hyracoids. Thus, the perforation (for.) 
of the base of the ascending process just behind the last molar occurs as 
in Hyraz, the angular region is greatly expanded, the posterior portion 
of the jaw being very deep. The coronoid on the fossil may have 
been a little less prominent than in the recent forms. The teeth are 
arranged in a rather strongly curved closed series. The canine which 
is slightly broken in front is a premolariform tooth, the crown of 
which consists of a compressed main cusp, with small posterior and 
probably anterior accessory cusps: this tooth seems to be borne by 
a single root, somewhat compressed from side to side. The premolars 
