No. 2.]' 



EMBRYOLOGY OF THE LIZARD. 



Z^l 



Wb. Wolffian body. 

 Wd. Wolffian duct. 

 tvHC. Wall of head-cavity. 

 *. Break in the embrjo. 

 y. Lateral nerve-cells giving rise to 

 transverse fibres. 



/, //, ///, eic. Hjoid and following 



gill-clefts. 

 Iv'. Primary first ventricle. 

 IIv. Ventricle of mid-brain. 

 IIIv. Ventricle of hind-brain. 



Where a number of figures represent sections, or the entire view, of the 

 same individual embryo all those figures have the same letter affixed to their 

 numbers. 



All figures of sections have been drawn with the Abbey camera lucida and 

 a Zeiss microscope, — Z. 2. A. means, Zeiss ocular 2 and objective A, etc. 



