160 Dr. C. IF. Andrcns — Notes on Egyptian Eocene Blammah.. 



The tibia is extremely similar to that of Dinoceras. 



It is in the tarsus that the relationship with the Amblypoda i& 

 most apparent. The astragalus in general shape is much lika 

 that of an elephant, but closer examination shows that its distal 

 articulation is divided by a well-marked ridge and angle into two 

 surfaces, one, much the larger, for the navicular, the other for the 

 cuboid. Internal to the navicular surface there is a small facet 

 which seems to indicate the presence of a distinct tibials. In all 

 essential respects the astragalus is very nearly like that of Coryphodon 

 or Dinoceras. The calcaneum is very short and stout ; there is 

 a large fibular facet, and the surface for the cuboid is small. 

 A navicular attributed to this animal is very similar to that of 

 Coryphodon. Detailed descriptions and figures of the foot-bones 

 and other parts of the skeleton will be given in the monograph. 



The dimensions of the figured specimens (Figs. 1 and 2) are : — 



Leug'th of upper molar series ... ... ... 23" 5 cm. 



Length of the three posterior upper premolars ... 11-5 ,, 



Length of lower molar series ... ... ... 23 ,, 



Length of loM'er in-emolar series ... .,, ... 14 ,, 



All that is at present known of the structure of Arsinoitherium 

 leads me to believe that it is a highly specialised, probably terminal, 

 member of a subdivision of the Amblypoda, probably most nearly 

 related to the Coryphodontida^, though belonging to a separate family, 

 the Arsinoitheriidae. I am also inclined to think that Barytherium, 

 though widely different in many respects, may have somewhat 

 similar relationships, and may belong to still another family of 

 the same sub-order. 



Geniohyiis minis, gen. et sp. nov. 



During the season 1902-3 a large part of the right ramus of the 

 mandible of a pig-like animal was collected by Mr. Beadnell. This 

 specimen, which is the anterior part of the right ramus of the 

 mandible together with the symphysis, presents some very remarkable 

 characters. The symphysial region is narrow both from side to side 

 and from above downwards and behind it, just where the rami begin 

 to diverge ; the ventral border of the jaw is produced downwards on 

 either side into a long decurved and backwardly directed process of 

 bone, quite unlike anything I am acquainted with in any other animal. 

 The hinder border of the base of this process is connected with the 

 outer edge of the ramus itself by a thin plate of bone. The ramus 

 is incomplete ventrally, but was evidently very narrow from above 

 downwards. The function of this remarkable paired ventral pi'ocess 

 is very doubtful, but possibly it may have served as a protection 

 for the projecting portion of a long ujjper tusk like the similarly 

 situated process on the mandible of the Dinoceras. 



The molars and premolars are in an excellent state of preservation, 

 the only part wanting being the greater portion of the talon of m. 3. 

 The characters of the molars are those of a primitive member of 

 the Suidai in which the selenodont character of the outer cusps 

 is very well marked. Each molar consists of two pairs of cusps. 



