PLATE XLVI. 



FIG. in. Mesentery of frog coloured In silver, a. Ordinary surface eudothelium. 4. EudotheHal cells i 

 rounding a simple true stoma. These cells have the germinating character, are distinctly grauular, and 

 not flat like those which surround them. p. 112. (Oc., 3; OV>j., 5. Tube not drawii out.) 



PIG. H2. Septum citterna lymphaticce magnce of frog, coloured iu silver. A. .View of peritoneal surface. 

 B. View of surface of lymph sac. The stomata, some of which are open, some collapsed, are surrounded by 

 germinating endothelium, which is ciliated if the subject is a female, p. 112. (Oc., 3; Ouj., 5.) 



