of Rhabdocoela, [47];

of Oligochaeta, [361]

Prostheceraeus, [19], [22];

spermatophores, [27]

Prosthiostomatidae, [19]

Prosthiostomum, [17], [18], [19], [24]

Prostomial tentacles, [248], [262]

Prostomium, [241];

of Dinophilus, [243];

of Polygordius, [244];