Polycentropus, [483]

Polydesmidae, [34], [36], [44], [76]

Polydesmus, [36], [39], [44]

Polymitarcys, [440]

Polymorphism, [500], [536]

Polynema natans, [538]

Polynephria, [175]

Polyxenidae, [43], [53], [59], [77]

Polyxenus, [33], [37], [48], [55], [72];

transverse section, [56];