Permian, jugular fish, [141].

Perodicticus, [105], [179].

Phalangers, [67].

Phasmidæ, [89].

Phyllopods, [79].

Physical actions, [253].

"Physiological units," [168], [218].

Pigeons' "boots," [181].

Placental mammals, [67].

Placental reproduction, [81].