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F. NAGY and R. H. EDMONDS

In the present report, we present certain facets of the fine structure of the epididymal spermatozoa of an edentate, the nine-banded armadillo, Dasypus novemcinctus mexicanus. Although numerous investigators have devoted considerable attention to the morphology of spermatozoa using both transmission (Cleland & Rothschild, 1959; Bedford, 1965; Blom & Birch-Andersen, 1965; Nicander & Bane, 1966; Fawcett & Ito, 1965; Phillips, 1970; Pedersen, 1970; Phillips, 1972) and scanning (Koehler, 1970) electron microscopes, the armadillo represents a mammalian species in which the fine structure of the spermatozoa has not been investigated. While numerous features common to most mammalian spermatozoa have been observed in the armadillo, we report here some of the more distinctive features.

Sexually mature, male, nine-banded armadillos were examined during April and May. The animals were maintained for brief periods in the laboratory

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R. H. EDMONDS and F. NAGY

Electron microscope studies of the vasa deferentia and epididymides of various animals have emphasized the endoplasmic reticulum of the epithelial cell to a greater or lesser degree (Nicander & Schantz, 1961; Horstmann, 1962; Leeson & Leeson, 1964; Schmidt, 1964; Holstein, 1964). Recent studies (Hamilton, Jones & Fawcett, 1969; Hamilton, 1971a, b) have stressed the morphological arrangement and the functional rôle played by the smooth endoplasmic reticulum. These studies have pointed out an abundant and characteristic accumulation of smooth reticulum in the mouse and rat. We would like to report an apparently unique accumulation of rough endoplasmic reticulum in the initial segment of the epididymis of an edentate, the nine-banded armadillo, Dasypus novemcinctus mexicanus.

Adult, sexually mature armadillos were anaesthetized with an intraperitoneal dose of Nembutal. The intra-abdominal testis, epididymis and