of Gephyrea, [421];

of Ctenostomata, [470], [477], [480], [481]

Colonial nervous system, [471]

Colony, of Myrianida, [281];

of Syllis ramosa, [282];

of Polyzoa, [466]

Colour of Polyclads, [20];

of Land Planarians, [33];

of Nemertinea, [102];

of Polychaeta, [291], [314], [340]