MARY J. ROSS. 



opening of these shallow pits or indentations into the lumen of 

 the eland, and even in some cases before that has occurred, the 



& 



cells ^of the surface epithelium and mesoderm begin to multiply 





..'','&$: :':-"./..',.*"..'.'.' v '-. \. ' 



: " /"'''--- "''***'... ' *',; .' 



*-0. '* 



FIG. 25. Same as Fig. 24. a., the original round cells have now divided, form- 

 ing groups of several cells ; d. , the indentations at the surface have deepened till they 

 resemble those of Amblyitoma ; ep. , the epithelial cells are becoming radially arranged 

 around the gland fundaments. 



rapidly, projecting into the cavity of the stomach. These first 

 outgrowths are, as Sewall ('79) describes them, in the form of 

 short ridges, not of villi, as described by Brand ('78) and Negrini 



" ttlf^P-ii, rJ^^:^4- S -W. 





FIG. 26. Same as Fig. 24. Here the epithelium is increasing in size, pushed out 

 also by increase in growth of the mesoderm to form the primary outgrowths or proc- 

 esses, //. The glands are nearer the surface and the pits for the ducts, d., are thus 

 being deepened ; /. , small central lumen. 



('86). By continued outgrowths along these depressions and 

 ridges the ridges intersect, resulting in a fine network. This is 

 clearly seen with the naked eye in stomachs taken from pigs 14 



