120 
TERTIARY VERTEBRATA OF THE FAYtM. 
from tlio groat trocliaiitcr {(j-tr.), wliich rises sliglitly above it, by a shallow rounded 
notch, 'fhe 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 u])])er 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 
re|)resentative of the third trochanter. Below this point the shaft is oval in section, 
the flattening being antcro-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 ligamentiim 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. 
Moeritherium lyonsi, Andrews. 
[Plates VIII.-XI. ; text-figs. 40-47.] 
1901. Mceritlierium hjonsi, ('. W. Andrews, Tagetdatt des V. Intornationaleu Zoologon-Congresses 
Berlin, No. (I, p. 4 (Verhandlungen, p. 528, 1902) ; (leol. Mag. [4] 
vol. viii. pp. 40;5-40G, fig. 2. 
1903. „ ,, C. W. Andrews, Phil. Trans, vol. 19G n, pp. 113-117, figs. 14-17. 
1904. „ ,, (1. W. Andrews, Geol. Mag. [5] vol. i. pp. 109-112, fig. 1. 
Type Specimen . — Mandible associated with upper molars and a dorsal vertebra 
(PI. X. figs. 1, 1 a); 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. & Loc. — Qasr-el-Sagha beds (Middle Eocene) and Fluvio-niarine beds 
(Upper Eocene) : north of Birket-cl-Qurun. 
C. 10000. Upper molars, inamlihle, and a dorsal vertebra. The mandible is the type of the species 
described in the ‘ Tageblatt des V. Internationalen Zoologen-Congresses,'’ no. fi, p. 4 
(Berlin, 1901); also described and figured in Geol. Mag. [4] vol. viii. (1901) pp. 403-5, 
