reduction in thickness, [373];
correlative changes, [328];
of Sphargis, [335] f.;
of Chelone, [379];
of Testudo, [322];
of Pleurodira, [389];
reduction in Trionychidae, [325];
fenestration, [325];
with hinge in Cinyxis, [364], [365]
Cardioglossa, [274]