Dryotriorchis, [154]

Du Bois, on Didus borbonicus, [330]

Duck, [114];

habits of, [113] f.;

fusion of tracheal rings, [13]–see Sheld-Drake;

Black, [119];

Blue, [116];

Brahminy, [129];

Buffel-head, [121];

Canvas-back, [122];