252 Robert Thompson Young, 



Plate 8. 



Fig. 1. A larva with the scolex rudiment just heginning to develop. 

 Only a small portion of liver tissue is shown in this figure. 850 : 1. 



Fig. 2. Chalk body of Taenia serrata , with two chalk body cells. 

 1200: 1. 



Fig. 3. The same, with one chalk body cell. 1200 : 1. 



Fig. 4. Developing nucleus and nuclear membrane in bladder wall 

 previous to formation of cuticula. 2850 : 1. 



Fig. 5. Nucleus dividing amitotically in bladder wall. Note Ihe 

 developing transverse nuclear membrane. 2100 : 1. 



Fig. 6. A group of developing cells in bladder wall. At x is 

 suggested the common origin of nuclear membrane and nuclear granules. 

 Note the large unstained zone surrounding the central granule. 1200 : 1. 



Fig. 7. Section of bladder wall previous to formation of cuticula. 

 2850: 1. 



Fig. 8. Protoplasmic mass from scolex of Taenia serrata. 2850:1. 



Fig. 9. Developing hook to show separate development of base ///,. 

 1000: 1. 



Fig. 10. Mass of cytogenetic protoplasm from bladder wall, showing 

 developing nuclei. 1200 : 1. 



Fig. 11. Developing cell from larva. 2000 : 1. 



Fig. 12. A group of developing cells in bladder wall. At least 

 one developing flame cell is here shown, x while, x^ and .a'^ may be 

 the rudiments of such cells. 1200 : 1. 



Fig. 13. Bladder wall of young larva showing developing nuclei. 

 X large, lobed nuclear granule, possibly dividing. 



Fig. 14. A young larva. 1000: 1. 



Fig. 15. A section of the wall of the larva represented in Fig. 1. 

 The section is taken from the anterior end at the region marked x. 1000 : 1. 



Fig. 16. The region marked x^ in Fig. 1, enlarged. 850: 1. 



Fig. 17. Developing hooks and cuticula. 1000 : 1. 



Plate 9. 



Figs. 18, 19, 21, 23, 25, 27 — 33. Flame cells of larva in different 

 stages of develo^Dment. 1000 : 1. 



Figs. 20, 22, 26. Flame cells from neck region oï Taenia scnrifa, 

 showing nuclei in different stages of condensation. 1200 : 1. 



Fig. 24. Flame cell from Taenia serrata. 1000 : 1. 



Fig. 34. Three developing flame cells from Taenia serrata. 1000:1. 



Fig. 35. Section of excretory duct from neck of larva, showing 

 budding of capillary at x. 1200 : 1. 



