Vol.LV. October, 1928. No. 4 BIOLOGICAL BULLETIN THE DEVELOPMENT OF THE SPERMATOZOON IN CAVIA COB AY A i MARY T. HARMAN AND FRANK P. ROOT. INTRODUCTION 235 MATERIAL AND METHODS 237 (a) Description of material 237 1. Period with little change in the shape of the cell 237 2. Period of elongation 239 3. Histogenesis of the elongate cell 240 DISCUSSION 241 SUMMARY 244 LITERATURE CITED 244 DESCRIPTION OF PLATES 248 INTRODUCTION. The development of the spermatozoon in the Mammalia has been observed in a number of forms but a detailed study has been made in only a few instances. Among the workers who have published observations on the development of the mammalian spermatozoon are: Lenhossek (1898), Meves (1898), Benda (1897, 1906), Korff (1902), Duesberg (1908, 1920), Jordan (1911), Oliver (1913), Stockard and Papanicolaou (1918), Gat-enby and Woodger (1921). There is a general agreement in the plan of the development but many differences of opinion exist with reference to the detail. Many of these differences are significant not only from the development of the spermatozoon itself but also from their bearing upon other biological problems. Since mam-mals are bisexual and have not been known to reproduce partheno-genetically, the continuity of the different parts of the male germ 1 Contribution from the Zoological Laboratory, Kansas State Agricultural College, No. 100. 16 235
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