Dr. C. W. Andrews — Extinct Egyptian Vertebrates. 403 

 The dimensions of the specimen figured ai-e as follows : — 



mm. 



Total length of specimen ... 610 



Depth of ramus in middle of diastema 96 



,, ,, immediately in front of p.m. 3 105 



,, ,, immediately beneath p.m. 4 120 



,, ,, at symphysis 97 



Dimensions of Teeth (in millimetres). 



p.m. 3 ... 

 p.m. 4 ... 

 m. 1 

 m. 2 

 m. 3 

 Approximate length of molar and premolar series ... 285 mm. 



Other specimens probably referable to this form are a maxilla 

 with two molars, a nearly perfect specimen of m. 2, a scapula, 

 a humerus, a femur, a tibia, an imperfect os innominatum, an atlas, 

 and an axis. 



Moeritherium Lyonsi,^ Andrews. (Fig. 2.) 



In the lower beds of probably Upper Eocene age a great quantity 

 of remains of an ungulate about the size of a large tapir was obtained. 

 These include numerous portions of the skull and mandible, some 

 with the teeth in good preservation, associated sets of vertebi'ee more 

 or less complete, ossa innominata, femora, humeri, etc. From these 

 it will eventually be possible to obtain a very good idea of the skeletal 

 structure of this animal. Here it will only be possible to refer 

 briefly to the skull and teeth. 



The skull is very massively built. The cranial region is depressed, 

 and the stout zygomatic process arises far back and projects strongly 

 outward. The external auditory opening is on the upper surface of 

 the base of this process, and is bordered posteriorly by an outgrowth 

 of the squamosal which grows round it as in the elephants. The 

 brain-case is relatively large. The orbit is small, and the nasals 

 seem to have been rather short, leaving a large narial aperture. 



The teeth are remarkable. In the upper jaw the median pair 

 of incisors are small, the second pair greatly enlarged, triangular 

 in section, and form a strong pair of downwardly directed tusks 



' " Tageblatt des V Internationalen Zoolo";en- Congresses," Berlin, No. 6, 

 August 16th, 1901, p. 4. The generic name refers to the fact that the remains of 

 the animal were found near the bed of the ancient Lake Mocris. The species is 

 named after Captain Lyons, Director-General of the Egyptian Geological Survey. 



Schweinfurth, in his account of the Fayum (Zeitschrift der Gesellschaft fur 

 Erdkunde zu Berlin, 1886, Bd. xxi, p. 139), states that in a hill about 12i miles 

 west from the temple discovered by him ho collected a jaw of Ztuglodon and two 

 mandibular rami of a creature resembling a pig or tajiir and corresponding in many 

 respecis to Chceropotamus. These specimens were atterwards described by Dames, 

 who [loc. cit. supra) states that the so-called Chceropotamus jaws are in fact the 

 anterior ends of mandibles of Zeuf/lodon. It seems not improbable, however, that 

 Schweinfurth was more nearly right, and that the specimens actually belonged to 

 the present species. A further examination of these specimens is desirable. 



