2S0 
TEETIAET VEETEBRATA OF THE FATtlM. 
jind posteriorly tlic marginals (M. 1-11) arc somewhat everted, but in the region 
of the junction with the plastron they are vertical. The angles of the bridge between 
the plastron and the carapace are greatly thickened and form a prominent border, 
upon which the shell rests. 
'fhe plastron (PI. XXIV. fig. 1 b; text-fig. 89) is larger and the openings of the shell 
Text-fig. 89. 
aid., abdominal shield; an., anal shield; Ent., eutoplastral hone; Ep.p., epiplastral bone ; /m., femoral 
shield: g., gular shield; li., humeral sliield ; Eyp., hyoplastral hone; Hyp.pi., hypoplastral hone; 
ptet., pectoral shield ; Xip., xiphiplastral hone. About t nat. size. 
are smaller than in most of the recent "iant Land-Tortoises. In some individuals, 
O 
including the type, the epijdastral region (Ep.p.) is prolonged forwards to a greater or 
less extent: as these have a deeply concave plastron, they are probably males. In the 
specimen figured on PI. XXIV. fig. 1 B, however, this projection is very slight: as the 
concavity of the plastron in this shell is very slight, it may be regarded as belonging to 
