Integument, [2] n.

Intestines, [12]

Intrathoracic convolutions of trachea–see Trachea

Iodopleura, [479], [480]

Iole, [506]

Ipocrantor, [463];

I. magellanicus, [464]

Irena, [504]-[506];

I. crinigera, [504]

Iridescence in feathers, cause of, [3]