(Cosenza) (Italy) MATERIAL AND METHODS Adult male specimens of Caiman crocodylus were captured in the State of Para, Brazil, Some small blocks of a testis were fixed by triple fixation (Sugihara et al., 1966). Other blocks were fixed in 31 glutaraldehyde in 0.1 M phosphate buffer, pH 7.2 and then in \l OsO 4 in the same buffer. After fixation, the blocks were dehydrated in ethanol, block-stained with uranyl-acetate, passed in propylene oxide and embedded in Epon-Araldite. Thin sections, stained with lead citrate, were examined with an Hitachi HU-12A electron microscope.

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