442 HOPKINS. 



EXPLANATION OF PLATE XXV^. 



Fig. 13. Two gastric glands opening into a single mouth. (Scaphirhynchops.) 



Figs. 14 and 15. Transection and longisection of gastric gland of Scaphi- 

 rhynchops. 



Fig. 16. Enlarged view of Fig. 13 showing the ciliated character of the cells in 

 the mouth portion of the gland. A, greatly distended beaker-cell. 



Fig. 17. Epithelium from the oesophagus of Lepidosteus showing ciliated 

 cells and beaker-cells. 



Fig. 18. Gastric glands of Polyodon. 



Figs. 19 and 20. Transection and longisection of gland (Polyodon). A, nucleus 

 undergoing division. 



Fig. 21. Epithelium from the stomach of Polyodon showing ciliated cells and 

 beaker-cells. 



Fig. 22. Transection and longisection of gastric gland (Amia). 



Fig. 23. Mouth of gastric gland, of Lepidosteus, showing the relation of the 

 cells of the gland to the ciliated epithelial cells on the surface of the stomach. 



Fig. 24. Mouth of gastric gland of Amia, showing the ciliated cells lining the 

 mouth and also a few beaker-cells. 



Fig. 25. Gastric gland (Amia). 



Fig. 26. Gastric gland (Lepidosteus). 



Fig. 27. Two beaker-cells from the stomach of Amia. 



Fig. 28. Ciliated epithelial cells from stomach of Amia. 



(Figures 18, 25, and 26 are on the same scale ; all the others of this plate, 

 except Fig. 13, are on the same scale as Fig. 15.) 



