PLATE 9 



EXPLANATION OF FIGURES 



58 Reconstruction of a 'plain' mesonephric tubule of Bdellostoma; diagram- 

 matic. 



59 Diagrammatic reconstruction of a 'compound' mesonephric tubule of 

 Bdellostoma. 



60 Sketch showing transition between the cells of the neck and those of the 

 trunk in a 'compound' tubule. X 250. 



61 Transverse section of a 'compound' tubule showing opening of the trunk 

 into the mesonephric duct. Camera, X 50. 



62 Transverse section through mesonephric duct of Bdellostoma no. 15, show- 

 ing a Malpighian body and its tubule. Camera lucida, X 30. 



63 Transverse section through mesonephric duct of Myxine no. 12. Camera 

 lucida, X 50. 



64 Enlarged sketch of epithelial ridges in mesonephric duct of Myxine no. 12, 

 showing core of yellowish granules. 



65 Sketch of ovary of one of the youngest specimens of Myxine (no. 18). 

 Natural size. 



156 



