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Alterations of cell organelles occurring during spermiogenesis lead to cell architecture adapted to fertilization. These alterations do not always occur in a similar way in different aimal spernaatids but are controlled by genetic factors specific for each organism. Many electron microscopic investigations have been carried out on several gastropod spermatozoa and their spermiogenesis (Grasse et al., 1956 ; Rebhun, 1957 ; Yasuzumi and Tanaka, 1958 ; Yasuzumi et al., 1960 ; Gall, 1961 ; Yasuzumi, 1964 ; Anderson and Personne, 1967 ; Walker and MacGregor, 1968 ; Galangau, 1969 ; Garreau de Loubreesse, 1971). However, so far as the present authors are aware, there has been no investigation devoted especially to the development of flagella of the gastropod spermatozoon. The cross-striated longitudinal columns in the connecting piece have been regarded as local specializations of proximal ends of nine coarse fibers (Blom and Birch-Anderson, 1960 ; Nicander and Bane, 1962a, 1962b, 1966 ; Anderson and Personne, 1967). While it has been suggested that the cross-striated elements of the connecting piece are distinct from the homogeneous coarse fibers of more distal segments of the flagellum (Fawcett and Ito, 1965 ; Fawcett, 1965 ; Fawcett and Phillips, 1969, 1970). Recently, as to the mode of origin of the coarse fibers of mammalian sperm flagella, Fawcett and Phillips (1969, 1970) have inferred that the coarse fibers originate as bridge-like radial outgrowths from the wall of the corresponding doublets in the axonemal complex. During the study on spermiogenesis of the yellow slug, a pair of

Spermatogenesis in Animals as Revealed by Electron Microscopy XXVIII. Development of Flagella of Spermatozoa of Limax flavus L.