426 HOPKIXS. [Vol. XI. 



part next to the lumen of the gland; the nuclei are large, either 

 oval or circular in section, and situated close to the attached 

 ends of the cells. In the fundus of the glands the nuclei, 

 especially those of oval outline, appear to be undergoing divi- 

 sion (Fig. 20). In many of the cells there may be seen extend- 

 ing across the short diameter of the nucleus a very deeply 

 stained band of chromatin; in these cells no nucleoli can be 

 seen. In the cells whose nucleus is circular in outline but one 

 nucleolus is present, as a rule, but sometimes two or more were 

 seen. In several instances nuclei were found somewhat con- 

 stricted in the middle, and still others where two distinct nuclei 

 were in direct apposition, each being somewhat smaller than 

 the original parent nucleus from which, to all appearances, the 

 two nuclei had been formed. 



This appearance of nuclear division in the fundi of the 

 glands is in perfect accord with the statements of several 

 authors who have shown that in the adult of certain mammals 

 the centers of growth of the enteric epithelium are situated in 

 the fundus of the glands. If this is true of fishes, it would be 

 interesting to know the exact concomitant changes which the 

 cell must undergo in the process of its transformation from a 

 non-ciliated glandular cell into a ciliated epithelial cell. The 

 glands are quite widely separated from each other by the inter- 

 vening mucosa, more so than in any of the other forms. The 

 diameter of the glands is also less than in the two preceding 

 forms, but this may be simply an individual variation. The 

 pyloric glands are lined by narrow cylindrical cells, among 

 which occasionally were seen greatly distended, coarsely granu- 

 lar beaker-cells. No cilia were found in this region, either in 

 the glands or on the surface. The thickness of the stomach 

 walls was previously alluded to; it is due in great part to the 

 excessive thickness of the submucosa, which forms a layer as 

 thick if not thicker than that formed by the muscular coats. 



Lepidosteus. 



In a specimen measuring 55 centimeters from the tip of the 

 snout to the tip of the tail the entcron extends in a direct line 



