Plasmodium, nature of, in Orthonectids, [94]
Plate, on Rotifers, [198], [225] n.
Platyaspis, [73]
Platycotyle, [73]
Platyhelminthes, [3] f.;
Nemertinea classed with, [119]
Plectanocotyle, [73]
Plectus, [160]
Pleionogaster, [381]
Plerocercoid larva, [84]