Abstract
In the Lepidoptera, it was found that the bundles of the spermatozoa contained in the post-testicular organs represent conspicuous spiralization (Figs. 1-18). The present investigation reveals that the length of the bundle, the direction and inclination of coiling and the number and radius of spiral gyres occurred in the bundle of spermatozoa, are species-specific characters. The results of the observations made concerning those points upon some 40 species of the Lepidoptera are given in Table 1. On the basis of the findings, the species under consideration are classified into 11 groups, with reference to the value of the inclination of coiling and radius of the gyre under rough estimation.
Some considerations were made on the development of the specific characters of bundles of spermatozoa and the bearing of that specificity upon the species cross when attempted.
