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].