on Siren, [136];

on hand-skeleton of Eryops, [286];

on Sphargis, [336];

classification of Lacertae, [513];

classification of Snakes, [592]

Cophophryne, [167], [168]

Cophyla, [236]

Copper-head, [646], [646]

Copulatory organs, of Lacertilia, [499];

absent in Sphenodon, [294];