AMKBOCYTES WITH SPHERULES. 



Sections of the Alimentary Canal. Transverse sections of the 

 wall of the esophagus show a lining epithelium of tall and ex- 

 tremely narrow cells. This epithelium extends nearly across the 

 whole thickness of the wall. Below the epithelium is a thin 

 layer of connective tissue, reticular in character. This layer is 

 invested by a thin tunica muscularis, superjacent to which is a 

 delicate peritoneal epithelium. A similar relationship of layers 

 exists in the wall of the intestine proper (Fig. 3), but the con- 



uc. 



FIG. 3. Transverse section through part of intestinal wall. Bo., amebocyte 

 with basophilic spherules; C.t., connective tissue layer; E.p., epithelium; F.d., 

 food droplets; Leuc., leucocytes; M., muscular layer; P., peritoneum. X 750. 



nective tissue layer is much thicker and thrown into folds which 

 are followed by the epithelium. At the base of each connective 

 tissue fold there are several lacunae. In the meshes of the 

 connective tissue strands there are numerous minute greenish 

 droplets. From the positional relationship of these droplets to 

 the intestinal epithelium, I infer that they are food droplets. 

 From the extreme minuteness of the droplets nearest the base- 

 ment membrane it seems that they have passed through the 



