Cephalization, [51]

Cephalodiscus, [438]

Cephalopod, [23]

Cerebellum, [47], [50]

Chætopoda, [395]

Chamber, oral, of Ammocœtes, [243], [287], [458]

Cheliceræ, [235]

Chiasma, optic, [101]

Chilaria, [235], [238], [291], [301], [458]

Chitin, [85], [119], [139], [205], [206], [302], [329], [346], [359], [440], [443]