7O MARY J. ROSS. 



the large cesophageal glands. But, whatever they may be as to 

 homology, all of the glands of the stomach are alike in the for- 

 mation of their early stages. 



The early stages in the formation of the gastric glands in 

 Desmognathus are easy to discern, as in this form there is com- 

 paratively little yolk present to obscure the cell outlines. The 

 first traces of the future glands are found in a larva of 1 1 mm. 

 total length. The cells are at first apparently many layers thick, 

 but on careful inspection it may be seen that they are arranged 

 in an orderly manner like simple columnar epithelium as shown in 

 Figs, i and 2. The nuclei, thus arranged at different levels, 



FIG. 2. Cross-section through the cardiac region of the stomach of a larva 11.5 

 mm. long. Gilson's. Letters as in Fig. I. This shows a round cell dividing in 

 two. Obj. T L, Oc. 2. 



give to the epithelium a stratified appearance, which is somewhat 

 misleading at first sight. In the same figures insinkings or slight 

 indentations on the free surface correspond to the cells whose 

 nuclei lie deep in from the surface (Figs. I and 2, d}. At the 

 base of the surface epithelium, resting almost upon the basement 

 membrane, are large round cells, with round or oval nuclei (Figs. 

 i, 2, ). These cells and nuclei are larger, clearer, and more 



