of Thaliacea, [95], [101]

Pericardium, of Hemichordata, [15];

of Tunicata, [44], [49];

of Fishes, [327]

Perihaemal spaces, [9]

Periophthalmus, [689], [690], [355];

eyes, [155];

pectoral fins, [161];

tail as a respiratory organ, [289];

P. koelreuteri, [690] n.