PLATE 2 



EXPLANATION OF FIGURES 



6 An outline sketch of figure 5, showing the position and phine of section of 

 the sections represented in figures 7 to 17. The number at the end of each line 

 corresponds with the number of the plate figure representing that level. 



7 Transverse section cutting the cloaca at the level of the urogenital papillae. 



8 Transverse section cutting the cloaca at the level of the orifice of the 

 urinary bladder. 



9 Transverse section of cloaca cutting the caudal end of the mesonephros 

 and passing through the dorsal ganglion in the region of its greatest extent. 



10 Transverse .section of the cloaca, showing the tubules of the cranial differ- 

 entiation of a pelvic gland. 



11 Transverse section of cloaca through the cranial ends of the lateral furrows 

 and ventral trough, showing the tubules of the lateral difTerentiations of the 

 pelvic gland. 



462 



