120 TEETIAEY VEETEBEATA OF THE EATtyM. 



from the great trochanter (g.tr.), which rises slightly above it, by a shallow rounded 

 notch. The lesser trochanter (l.tr.) is a very prominent ridge of bone forming the 

 inner border of the large digital fossa. From the most prominent point of the inner 

 trochanter a slight ridge runs obliquely to the base of the great trochanter, dividing 

 the fossa into an upper and lower section. The middle portion of the shaft is roughly 

 triangular in section, the outer angle forming a roughened ridge, which is the only 

 representative of the third trochanter. Below this point the shaft is oval in section, 

 the flattening being antero-posterior. The trochlear surface is small, and the ridge 

 forming its outer border somewhat the more prominent. Both condyles are small; 

 the outer is somewhat the larger, though at the same time the inner projects a little 

 beyond it. Posteriorly the condyles are separated by a deep and narrow intercondylar 

 fossa. The posterior surface of the shaft immediately above the condyles is slightly 

 concave from side to side. 



In its straightness, in the relatively small size of its articular ends, and in the 

 absence of an inner trochanter, this femur is not unlike that of the later Proboscidea ; 

 and while the presence of a depression for the insertion of the ligamentum teres is a 

 point of difference between it and most of the later members of the group, a deep and 

 similarly situated pit occurs on the head of the femur of Palceomastodon. 



ILoerithermm lyonsi, Andrews. 



[Plates VIII.-XI. ; text-figs. 40-47.] 



1901. Moeritherium lyonsi, C. W. Andrews, Tageblatt des V. Internationalen Zoologen- Congresses 



Berlin, No. 6, p. 4 (Verhandlungen, p. 528, 1902) ; aeol. Mag. [4] 

 vol. viii. pp. 403-406, fig. 2. 



1903. „ „ C. W. Andrews, Phil. Trans, vol. 196 B, pp. 113-117, figs. 14-17. 



1904. „ „ C. W. Andrews, Geol. Mag. [5] vol. i. pp. 109-112, fig. 1. 



Type Specimen. — Mandible associa,ted with upper molars and a dorsal vertebra 

 (PI. X. figs. 1, 1a); Geological Museum, Cairo. 



The type species, in which the length of the mandible is about 32 cm., and that of 

 the molar and premolar series 17'2 cm. 



Form. & Log. — Qasr-el-Sagha beds (Middle Eocene) and Fluvio-marine beds 

 (Upper Eocene) : north of Birket-el-Qurun. 



C. 10000. Upper molars, mandible, and a dorsal vertebra. The mandible is the type of the species 

 described in the ' Tageblatt des V. Internationalen Zoologen-Congresses,^ no. 6, p. 4 

 (Berlin, 1901) ; also described and figured in Geol. Mag. [4] vol. viii. (1901) pp. 403-5, 



