Plaie VI. 



Fig. 1. MicRocoTYLE SEE A ST IS. Median Sagittal section through the region 



of the genital atrinm. x 305 cliara. 

 „ 2. MicRocoTYLE S c I A E N A E. Median Sagittal section through the region 



of the genital atrium, x 305 diam. 

 „ 3. M I c R c T Y L E c A u D A T A. Successivc stages of spermatogenesis, x 305 



diam. For detailed description see p. 80 of the text. 

 „ 4. DiPLozooN NippoNicuM. Successive stages of spermatogenesis, x 427 



diam. In u and h only the nucleus is represented ; and in c and d the tail 



is cut short. For detailed description see p. 88 of the text. 



