Pristina, [377]
Proales, [204], [224], [226], [227]
Proboscidae, [49];
occurrence, [44]
Proboscis, of Nemertinea, [100], [101] f., [103] f.;
of Hoplonemertea, [104], [110];
opening by mouth, [117], [119];
severance of, [116];
of Acanthocephala, [174] f.;
of Rotifers, [203];