Note on the Early Development of Lacerta Muralis

THE following paper contains an account of some observations on the early stages in the development of Lacer ta mural is , begun during the summer of this year at the zoological 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 Professor 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 meroblastic type, has already been fully described and figured by