212 Dr. C. W. Andrews — Notes on Egyptian Eocene Mammals, 



are in fairly good condition. The mandible is long and narrow 

 from above downwards, the distance between the last tooth and 

 the condyle being remarkably great. The transversely elongated 

 cylindrical condyle is about on a level with the alveolar border^ 

 and is separated from the prominent angle by a deep notch ; the 

 coronoid region is imperfect. The teeth are not very unlike those 

 of Pterodon, but it may subsequently be found necessary to establisk 

 a new genus for the present species. The last molar is represented 

 by the alveolus only. M. 2 consists of a high blunt main cusp, 

 a small antero-internal cusp, and a large talon with a blunt cutting 

 edge near its outer side. M. 1 is much smaller than m. 2, but the 

 talon is relatively larger and consists of a distinct tubercle, on the 

 inner side of which there is a prominent cingular ridge. The last 

 premolar (pm. 4) is much larger than m. 1 ; it consists of a high 

 cusp and a small talon ; the cingulum is distinctly developed on the 

 inner side of the tooth. Pm. 3 and pm. 2 are simple conical two- 

 rooted teeth, the crowns being small in comparison with the roots, 

 at least in pm. 3. Pm. 1 was a small one-rooted tooth, squeezed 

 outwards by the large canine, which was oval in section. The three 

 incisors wei"e so crowded together that the median one was situated 

 behind and above the other two. 



On the outer side of the jaw beneath the premolars there were 

 four foramina separated by equal intervals. The dental foramen 

 lies far back and is very small. This species may for the present 

 be referred to Pterodon under the name P. macrognathus. 



The dimensions of the type-specimen (No. 8982, Cairo) are : — 



mm. 



Total length of the jaw 212 



Depth of ramus at hinder end ot the symphysis 32 



Depth of ramus beneath m . 3 ... ... ... ... ... 32 



Length of symphysis ... ... ... ... ... ... 58 



Width of condyle 23 



Distance between hinder border of the alveolus of ni. 3 and the 

 posterior angle of the condyle ... ... ... ... 102 



Length of the alveolus of ra. 3 16 



m. 2 16 



„ m. 1 13 



pm- 4 17 



,, pm. 3 14 



,, pm. 2 12 



Antero -posterior diameter of canine ... ... ... ... 20 



Geniohyus major, sp. nov. (No. 8980, Cairo). 

 Three beautifully preserved premolars (pm. 1, 2, 3) indicate the 

 existence of an animal closely similar to Geniohytis fajumensis, but 

 much larger, the antero-posterior length of the teeth in the two 



species being — 



Gemohyus major. G. fajumenms. 



pm. 1 18 mm 13 mm. 



pm. 2 19 , 14 ,, 



pm. 3 20 , 1.) ,, 



In fact, the length of the three anterior premolars in the present 

 species is the same as that of the whole premolar series in G. fajumensis. 

 In structure these teeth differ from those of G. fajumensis in much 



