Montgomery claimed in his paper published in 1911 that:
1. The entire cytoplasm, sphere, and mitochondria in Peripatus are stripped off and rejected during the last stages of sperm-formation.
2. That there is no acrosome in Peripatus other than the attenuated head of the sperm.
3. That the centrosome swells up to form a large bead stuck on to the elongating spermatid nucleus, and that this centrosome (centriole) eventually shrinks somewhat in size and forms a middle-piece between nucleus and flagellum.
4. That the sphere has no connexion with the formation of the acrosome.