2 C. W. Andreics — A Neio CheIo)iian from Egypt, 



relatively very small. There are eight pairs of costals {c, 1-8), 

 of which the last two meet in median suture ; possibly also the 

 sixth pair were only partly separated by the last neural. The 

 positions of the facets for union with the inguinal and axillary 

 buttresses of the plastron are marked + in Fig. 1 of the Plate. 

 The furrows marking the boundaries of the horny plates are very 

 distinct ; the vertebral shields are somewhat balloon-shaped, and in 

 their anterior half are nearly twice as wide as they are posteriorly. 

 The outlines of three complete vertebrals are preserved and portions 

 of two others. 



The general form of the plastron is shown in Fig. 2, PI. I. The 

 entoplastral {ent.) is lozenge-shaped, with slightly convex posterior 

 borders. There is a pair of small mesoplastrals wedged in between 

 the outer ends of the hyo- and hypoplastra. The xiphiplastra {xp.) 

 bear on their upper surfaces rugose prominences (Fig. 3), indicating 

 the firm sutural imion of the ischia [is.) and pubes (pw.) with the 

 plastron. The posterior border of the plastron is notched. 



There is a very small intergular {i.g.), the posterior end of which 

 does not extend so far back as the anterior angle of the entoplastron, 

 and only separating the gulars {g.) for about a thii'd of their length. 

 The sutures between the humerals and pectorals cross the ento- 

 plastron in front of its middle point. In the proportions and 

 arrangement of these anterior plastral shields this species approaches 

 P. madagascariensis very closely. The abdominal, femoral, and anal 

 shields do not present any peculiarity. 



The total length of the plastron is 33'5cm. : the length of the bridge, 

 lo'o cm. ; width of plastron immediately in front of bridge, lo*5 cm. 



The existence of a firm sntural union between the pelvis and 

 plastron shows that this Chelonian belonged to the Pleuradiran 

 group, and the presence of mesoplastra further indicates that it 

 is referable to the family Pelomedusidfe. In this family the 

 mesoplastra are small and laterally situated in two genera, 

 Pelomediisa and Podocnemis, to the latter of which the fossil 

 approaches most nearly, and, as already mentioned, is in some 

 respects extremely similar to Podocnemis madagascariensis. 



The remains of P. cegyptiaca seem to be very common at 

 Moghara, and some of the specimens indicate that it attained 

 a considerably greater size than the specimen now figured. 



EXPLANATION OF PLATE I. 



Carapace and Plastron of Podocnemis -TiGVPTiACA (type-specimen). 

 Fig. 1. — Carapace (dorsal view). Fig. 2. — Plastron (veiitral view). 

 Fig. 3. — Xiphiplastral region of plastron (upper surface). 

 (About one -third natural size.) 



/ibd. Abdominal shields . 

 an. Anal shields. 

 <" i-g. Costal plates. 

 ent. Entoplastral plate. 

 ep. Epiplastral plate. 

 fern. Femoral shield. 

 (J. Gular shield. 

 h. Humeral shield. 

 hp. Hypoplastral plate. 



hy. Hyoplastral plate. 



i.g. Intergular shield. 



is. Surface for union with ischium. 



mp. Mesoplastral plate. 



u. Neural plate. 



pec. Pectoral shield. 



pu. Surface for union with pubis. 



xp^ Xiphiplastral plate. 



