TERTIAEY VEETEBEATA OE THE FAYCM. 
Plastron (coyit.) : 
Length of cntoplastral bone 8-7 
AVidth of entoplastral bone SY 
Jjengtb in middle line of liyo[)lasf ral 7'0 
,, ,, bypoplastral 11 
„ „ xipbiplastral t)'5 
Length of intergidar shield 8 
R. 3345. Anterior portion of jilustron, sliowing tlie thickenings on the inner face of the epiplastrals. 
AVidt.h of anterior lohe 22 cm. ; lengtli of ditto in middle line 8'2 cm. ; length of 
cntoplastral G'8 cm. 
R. 3200. Anterior portion of plastron : the form of the cntoplastral is rather different from that 
seen in the other two specimens, being more escntcheon-shaped. AVidth of anterior 
lobe of ])lastron H) cm. a])}). ; length of ditto in middle line 8 cm.; length of ento- 
plastral (i cm. ap[). Presented hy TL. E. de Winton, Esq., 1903. 
R. 3347. Proximal half of a left hnmerns of a medium-sized tortoise, provisionally placed here. 
This specimen is similar to the hnmerns of Podocneinis, e.xcept that the ulnar crest is 
less developed and the head less rounded, though this latter character may he due to 
partial abrasion. 
Stereogenys libyca, Andrews. 
[Text-fig. 97.] 
1903. Stereogenys Uhyca, C. AY. Andrews, Ann. & Alag. Nat. Hist. [7] vol. xi. pp. 115-119, pi. vii. 
I'dOo. ,, ,, A. von Peinach, Abhandl. Senckenherg. naturf. Gesell. vol. xxix. jit. 1, 
p[). 41-15, 111. xii., pi. xiii. tigs. 1, C-9. 
Type Specimen. — A nearly complete shell (text-fig. 97); British Mnseum. 
This species is distinguished from S. cromcri by possessing a more convex shell, 
somewhat expanded posteriorly, and a nuchal bone considerably wider tlian the first 
vertebral shield. From S. 2 >odocnemioides it difi'ers in having the humeral shields 
widely separated posteriorly by the intergidar. 
Form. A* Loc. — Fluvio-marine beds (Upper Eocene): north of Birket-el-Qurun. 
'I'he specimen (text-fig. 97) upon which this species is founded is a very well- 
preserved shell, wanting only a jiortion of the left side of both the carapace and 
plastron ; the pelvic bones were found in situ in the shell. Although cracked in 
all directions this specimen seems to be (piite undistorted and gives a good idea of 
the form of the living animal. In its general form the shell is very like that 
of Fodocnemis madacjascariensis, but rather more convex, particularly in the region 
covered by the last vertebral shield, where there is a well-marked prominence. The 
carapace is scjiriewhat expanded posteriorly. 
'rinn'c are seven neural bones (text-fig. 97, A), the series being separated from the 
nuchal in front and from the sii])ra[)}gal behind by ihe union in the middle line of 
