Pirate Perch, [656]

Piratinga, [361]

Pirinampus, [588]

Pit-organs, [383]

Pituitary body, [129]

Placenta, of Doliolum, [98];

of Hemimyaria, [101], [107];

of Fishes, [434]

Plagiostomi, [442] f., [148]

Plagusia, [687]