PLATE 8 



EXPLANATION OF FIGURES 



49 Ventral view of excretory system of a young male, Bdellostoma no. 6. 

 One-half natural size. 



50 Transverse section through the mesonephric duct of an adult male, Bdell- 

 ostoma no. 16, cut in the mid-region of the body cavity. Camera lucida, X 19. 



51 Transverse section through the mesonephric duct of an adult female, 

 Bdellostoma no. 15, cut in the mid-region of the body cavity. Camera lucida, 

 X 19. 



52 Transverse section through the anterior end of a mesonephric duct of 

 Bdellostoma no. 6, X 90. 



53 Enlarged sketch of a ridge in the epithelial lining of a mesonephric duct. 

 Bdellostoma. 



54 Enlarged sketch of the anterior ends of the mesonephric ducts of Bdello- 

 stoma no. 4, mounted in damar. 



65 Enlarged veneral view of the mesonephric ducts of Bdellostoma no. 8, 

 showing location of the Malpighian bodies with reference to the somites. 



56 Enlarged sketch of mesonephric ducts of Bdellostoma no. 16 showing 

 the distribution of the arteries to the Malpighian bodies. 



57 Longitudinal section through the tubule of a Malpighian body of the 

 mesonephros, Bdellostoma no. 17. 'Plain' type of tubule. Camera lucida, X 

 90. 



154 



