Plate VI. 



Fig. 1. MicRocoTTLE sEBASTis. Median Sagittal section through the region 



of the genital atrium, x 305 diam. 

 „ 2. MiCRocoTYLE sciAENAE. Median Sagittal section through the region 



of tlie genital atrium, x 305 diam. 

 „ 3. MicEocoTYLE CAUDATA. Successive stagcs of Spermatogenesis, x 305 



diam. For detailed description see p." 8G of the text. 

 „ 4. DiplozoonNipponicum. Successive stages of spermatogenesis. x427 



diam. In a and b only the nucleus is represented ; and in c and d the tail 



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



