Br. C. W. Andrews — Fauna of Wadi-Natrun, Egyi^t. 435 



The premolar is extremely like that figured by Gaudry in the 

 paper referred to. The form of the cingulum and of the postero- 

 internal cusp, as well as the sculpture of the enamel, are almost 

 identical. In these points also some premolars of H. sivalensis are 

 very like our specimen, and in H. liberiensis this prominent postero- 

 internal cusp is regularly developed on the lower premolars. The 

 form of this tooth is well shown in Fig, 2. It is much larger than 

 the corresponding tooth in H. liberiensis, and is about the same size 

 as some specimens of the premolars of H. sivalensis. Its width is 

 19 mm., its length 32 mm. 



Of the two upper molars, one (m. 3) is quite unworn. This 

 specimen is shown in Figs. 3 and 4. The cingulum is very well 

 developed, particularly on the anterior border, and at either end of 

 the transverse valleys there are a number of tubercles which seem 

 also to belong to tlie cingulum. The anterior pair of cusps are 

 higher than the posterior, and the inner stand slightly above the 

 outer. The sides of the columns are pinched in by vertical grooves 

 on their anterior and posterior faces (see Figs. 3, 4, and 5), so that 

 each column shows the usual trefoil pattern as soon as wear has 

 removed the summit. In this these teeth differ from those figured 

 by Pantanelli, and also from those of H. liberiensis, in which, the 

 trefoil is imperfectly developed. The teeth, moreover, are more 

 brachydont than those of H. amphibius or H. liberiensis, i.e. the 

 height of the cusps is rather less in proportion to the other 

 dimensions of the teeth than in those species, and the longitudinal 

 valley is rather deeper. The enamel is thickly sculptured by 

 a series of more or less vertical grooves, and there is also a very 

 fine horizontal striation, best shown on the cingulum and near the 

 base of the crown (see Fig. 3). 



The other molar (m. 2, Fig. 5) belonged to a somewhat smaller 

 individual. The cingulum is strongly developed all round and 

 sends spurs into the openings of the transverse valley. Wear has 

 commenced, and is most marked on the antero-internal cusp ; the 

 pattern is shown in Fig. 5, where it will be seen that indications 

 of the trefoil pattern are already noticeable. Wear is also well 

 marked on the inner faces of the transverse valley, the cusps of the 

 lower molar having worked between those of the upper. In this 

 tooth also the slightly more brachydont condition is apparent. 



The dimensions of the teeth, figured are : — 



Approx. height 

 Length. Width. of crown, 



p.m. 3 ... ... 32 mm. ... 19 mm. ... 31mm. 



m. 2 36 ,, ... 35 ,, ... 27 ,, 



m. 3 39 „ ... 39 „ ... 33 „ 



A number of limb bones referable to Hippopotamus have been 

 determined by Dr. Studer {op. cit. supra). One of these specimens 

 is a small humerus (see figure in text) which no doubt belongs to 

 the present species. It is very closely similar to the humerus of 

 H. sivalensis, with which I have compared it, but at the same time 

 is somewhat smaller. The presence of an irregular perforation in 



