[Ultrastructure of the double and multiple flagella of the sperm of the drake].

The structure of double and multiple flagella of the spermatozoa of a drake was investigated. In spermatozoa with this defect one or two implantation pits were observed in the head of the spermatozoon with one or two proximal centrioles situated in the extended base of the nucleus. The structure of the proximal centrioles was frequently disturbed. Distal centrioles were placed separately without any marked figural or structural disturbance. The mitochondrial sheath was formed around both or more flagella, and between the flagella only one line of mitochondria was usually found. The ring showed defects in shape and changes in the deposition. An amorphous sheath was formed around each flagellum separately without any marked defects. In single cases insignificant changes were recorded in the arrangement of fibrils of the axial bundle.