DESCRIPTION OF PLATES. 



PLATE I. 



The outline of the figures, except lo and ii were drawn by aid of 

 Abbe's camera lucida. Details were put in free-hand. Objectives used 

 were Leitz Nos. 2, 5, 7, and j\ oil immersion. Oculars Nos. i and 3. 

 All figures, except 1,2, 10 and 11 are drawn on the same scale. 



Fig. I. Section of stomach showing the relative thickness of the 

 different coats, a. mucosa, b. Submucosa and muscularis mucosa, 

 c. Circular muscular layer, d. Longitudinal muscular layer. 



Fig. 2. Gastric gland. 



Fig. 3. Epithelial cells of stomach, a. Ciliated cells, b. Beaker- 

 cells with mass of exuded mucus. 



Fig. 4. Mouth of gastric gland showing the ciliated epithelium with 

 which it is lined ; also two glands opening into a single mouth, a. 

 Beaker cell. 



Fig. 5. Transection of gastric glands. 



Fig. 6. Longisection of gastric gland. 



PLATE II. 



Fig. 7. Ciliated epithelium of the rectum, showing ciliated and 

 beaker-cells and the nuclei at various levels. 



Fig. 8- Cells of rectum as seen on end. b. Columnar cells, c. 

 Beaker-cells. 



Fig. 9. Epithelial cells of intestine showing form of cells and striated 

 border, d. Beaker-cell. 



Fig. 10. Diagram of head of Amia showing the connection of the 

 subcutaneous lymphatic system with the veins ; the operculum has 

 been removed, a. Pectoral arch. b. Cephalic lymph sinus, c. Jugu- 

 lar vein. d. Duct of Cuvier. e. Lateral lymphatic, i. gill. p. Pec- 

 toral fin. s. Serrula. By looking closely at the diagram of the lymph 

 sinus, the connection with the vein may be seen. Caudad of this is 

 another opening into the pericardial sinus ; the pericardial sinus itself 

 is not represented, only the orifice between the two being figured. 



Fig. II. Diagram showing the relation of the subcutaneous lymphatic 

 and venous system at the caudal end of the body. a. Dorsal fin. b. 

 Caudal fin. d. Anal fin. e. Axon. i. Caudal vein (the caudal artery 

 has been omitted). 1. Lateral lymphatic vessel ; the one on the oppo- 

 site side is indicated by broken lines, s. Caudal lymph sinus. The 

 opposite one is indicated by dotted line. o. Lymph vessel at base of 

 caudal fin. This is continuous with the lymphatic along the ventri- 

 meson as shown in diagram, t. Connecting branch between the lym- 

 phatic vessel ai the base of caudal fin and the lateral lymphatic vessel, 

 r. Branch connecting the dorsal and lateral lymphatic vessels, u. Dor- 

 sal lymphatic vessel, v. Lymph vessel along ventri-mesou. 



