Chromosomes [91], [95], [96], [98], [130], [131], [132]

Cleavage [21], [22], [94]

Clover butterfly [62]

Club wing [69], [70], [108]

Colias philodice [62]

Color blindness [77], [125]

Comb of Drosophila [103]

Combs of fowls [33], [54]

Comparative anatomy [7], [8], [9], [14]

Corn [150], [153], [172]