THE SPERMATOGENESIS OF THE CADDIS—FLY (PLATYPHYLAX DESIGNATUS WALKER)

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Abstract
1. The development of the follicular cysts can be readily followed in this insect. Each cyst contains 32 cells derived by 5 divisions from a primary spermagonial cell and enclosed in a membrane containing one or two nuclei. 2. The reduced chromosome number is always 30; the somatic number is probably 60 from a count in the oogonial divisions. 3. The centrosome is only to be followed from the tetrad stage to the anaphase but probably forms the middle piece of the sperms. 4. The nucleolus of the spermatocyte seems to form a tetrad which becomes one of the thirty of the reduced number.

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