of Kinorhyncha, [237];

of Echiuroidea, [434]

Proboscis-pore of Nemertinea, [102], [103]

Proboscis-sheath of Nemertinea, [103], [103] f.

Procerodes, [42]

Procerodidae, [42]

Procerus, host of Gordius, [172]

Procotylea, [36], [42]

Proglottis, [5], [74], [75], [79], [85]

Promesostoma, occurrence, [44];