440 



HOPKINS. 



EXPLANATION OF PLATE XXVa. 



All the figures of this plate except 2, 3, and 4 are from the common sturgeon. 



Figs. 1-4. Diagrams of the enteron : 



Fig. I. Common sturgeon. A pyloric caeca. 



Fig. 2. Lepidosteus. B pyloric caeca. 



Fig. 3. Polyodon. C pyloric caeca. 



Fig. 4. Amia. 



Fig. 5. Pigment cells in the peritoneum of the enteron. 



Fig. 6. Gland from near the cephalic end of the stomach showing the long 

 upper portion of the tubule lined by columnar ciliated cells and the short glandular 

 portion at the base. 



Fig. 7. This shows the mode of transition from the stratified epithelium of 

 the oesophagus (or pharynx) to the ciliated columnar epithelium of the suc- 

 ceeding part. 



Fig. 8. Enlarged view of Figs. 6 and 9 at points A and B. 



Fig. 9. Gastric gland from near the middle of the stomach. 



Fig. 10. Longisection of gastric gland. 



Fig. IX. Transection of the same. 



Fig. 12. Ciliated epitheUum of the stomach. 



