134 W. F. R. WELDON. 



Note on the Early Development of Lacerta 

 Muralis. 



W. F. R.^eldon, B.A., 



Scholar of St. John's College, Cambridge, Assistant Demonstrator in the 

 Morphological Laboratory of the University. 



With Plates IV, V, VI. 



The following paper contains an account of some observa- 

 tions on the early stages in the development of Lacerta 

 muralis, begun during the summer of this year at the zoo- 

 logical station at Naples and completed in the morphological 

 laboratory at Cambridge. It relates chiefly to the mode of 

 formation of the germinal layers and to the early development 

 of the kidney. 



On my return from Naples I found that in June last Pro- 

 fessor C. K. Hoffmann^ had published an account of the mode 

 of formation of the germinal layers, and the results obtained 

 by him agree generally with my own. As, however, Professor 

 Hoffmann has published very few figures of the stages observed 

 by him, and as my observations lead me to differ from him in 

 one or two points of detail, it has seemed to me that it would 

 not be useless to give a short account of my own results. 



The segmentation, which conforms to the ordinary mero- 

 blastic type, has already been fully described and figured by 



* C. K. Hoffmann, "Contribution a I'Histoire du Dcveloppenieut des 

 lleptiles," 'Arch. Neerlandaises des Sciences exactes et Katurelles,' t. xvii. 



