The purpose of this paper is to describe in detail a case of incomplete hermaphroditism in the domestic fowl. It is shown that : 1. In its external somatic characters the specimen was an antero-posterior gynandromorph. 2. Internally the bird possessed on the left side a large, lobulated gland in the position and anatomical relations normal to the ovary. There was also a fully developed, normal oviduct, in functional condition on the left side of the body. 3. On the right side of the body was a small organ in the position and anatomical relations normal to the right testis. Attached to this organ was a normal epididymis and vas deferens leading to the cloaca. 4. Microscopical examination showed that both sex glands were in a condition of extreme degeneration. Neither spermatogenesis or oögenesis could be found in any part of either gland. 5. Certain theoretical aspects of the case are discussed.