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SUMMARY 



The onthogenetical development of amphimictic organizms begins from fertilization 

 secured by insemination. The external insemination is native to many marine invertebra- 

 tes, all terestrial animals including insects are characterized by inbernal mode of insemi- 

 nation. Properties of the soil as environment — intermediate one between the acquatic 

 and terestrial s. str. — determine the insemination character in lower Arthropods, 

 connected with soil, called by the author "externo-internal". The following evolution 

 of insemination mode in Pterygota is realized by introduction of the sjaermatophore into 

 the gonoducts of the female and with the reduction of the spermatophore. The changes 

 of environment: "water— soil— air" — corresponds to the change of insemination ty- 

 pes in the course of insects phylogenesis: "external — externo-internal — internal "one. 



55 



