lung of ss. 142, et seq.;
chordæ vocales, [147];
prehensile tails, [180];
saltatory motion, [184];
exquisite organization of the spinal column, [196], [336];
ss. are acrobats, [198];
spine of py., [210];
ichthyic characters of the Lepidosiren, [244];
the sea-ser., [254];
the Bucephali, [408].