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



SagJiatheriiim magnum, sp. nov. 



Further examination of the type of Saghatheriiim antiquum, in the 

 museum at Cairo shows that a specimen of the upper dentition 

 preserved in the British Museum, which I had regarded as belonging 

 to that species, is actually much larger and differs slightly in some 

 other points. I propose, therefore, to make this specimen the type of 

 a new species, Saghatherium magnum. The approximate dimensions, 

 compared with those of the type of <S. antiquum, are : — 



Length. 



Cheek teetli (molars, premolais, auil cauiue) 

 Premolar series ... 

 Molar series 



m. 3 



m. 2 



m. 1 



pm. 4 



pm. 3 



pm. 2 



pm. 1 



The separate teeth are measured along their outer wall. 



One of the most striking differences between the two species, 

 other than size, is that in the last molar of S. magnum the metastyie 

 is much less developed than in S. antiquum. 



The anterior portion of the upper jaw showing the large incisor, 

 figured in the Geological Magazine, 1903, p. 340, under the name 

 >S'. antiquum, is actually part of the type-specimen of the present 

 species. 



All the species described above are from the Upper Eocene beds 

 of the Fay urn. 



Zeuglodon isis, Beadnell MS. 



The existence of a large species of Zeuglodon other than Z. osiris. 

 Dames, in the beds beneath the Qasi'-es-Sagha series has already 

 been referred to by Stromer ^ and also in this Magazine (1901, p. 437). 

 Mr. Beadnell refers to this species in his memoir on the geology of 

 the district, which will be published shortly, as Zeuglodon isis, and 

 this name is here adopted. The most important specimen, which 

 may be taken as the type, is a right ramus of the mandible complete 

 as far as the back of the tooth series; this was collected from the 

 Birket-el-Qerun beds of the Middle Eocene. The teeth in the 

 anterior portion are lost, but the hinder ones are present, though 

 somewhat broken and obscured by matrix which cannot be removed. 



The total length of the specimen is 83 cm. In front it terminates 

 in a blunt point, and is convex from above downwards on its outer 

 face, while the inner face forms a flat symphysial surface for union 

 with the opposite ramus. The depth of the ramus at the second 

 alveolus is about 64 mm., but posteriorly it deepens, till behind 

 the last molar it is about 220 mm. The extreme anterior end is 

 occupied by an empty alveolus, and behind this there are three 



* " Zeuglodon -reste ausdem Oberen Mitteleocaen des Fajum" : Beitr. Tal. u. Geol. 

 Oster.-Ung. u. d. Orients, Bd. xv. Heft 2 and 3 (1903), p. 83. 



