length of life of males and females, [54].
Pollen-grains, [222].
Polyphemus, spermatozoa of, [176];
summer eggs of, [239];
polar bodies of, [345].
Polyplastides, definition of, [120], [122], [125], [159];
development of, [152].
Polyzoa, length of life of, [57].
Poulton, on colours of caterpillars, [394];
on cats with supernumerary toes, [426].