The life history of Diplodiscus temporatus Stafford. 657 



Unless otherwise stated , all figures are drawn with camera lucida 

 at the magnification obtained with the Zeiss immersion objective 1,5 mm 

 and compensating ocular 12. 



Plate 30. 



Fig. 1. Adult worm somewhat contracted, drawn from the ventral 

 side as a transparent object. Zeiss Obj, 16 mm and Comp, ocular 4. 



Fig. 2. Same specimen drawn from the dorsal side. Same magni- 

 fication. 



Fig. 3. Sporocyst from liver of Goniobasis. Zeiss Obj. 8 mm and 

 Comp. Ocular 4. 



Fig. 4. Redia from liver of Goniobasis. Same magnification as last 

 figure. 



Fig. 5. Encysted cercaria. Zeiss 8 mm and Comp, ocular 4. 



Fig. 6. Mature cercaria drawn as a transparent object from the 

 dorsal side. The cystogenous glands are omitted on the right side of 

 the figure. Zeiss Obj. 8 mm and Comp. Oc. 4. 



Plate 31. 



Fig. 7. Slightly diagonal longitudinal section through a mature 

 cercaria before encystment, to show the external opening of the water 

 vascular system. Zeiss Obj. 4 mm and Comp. Oc. 4. 



Fig. 8. Transverse section through the body of a nearly mature 

 cercaria which had given off the contents of the cystogenous glands while 

 still within the body cavity of the mother redia. 



Fig. 9. Section through a very young sporocyst. 



Fig. 10. Section through an older sporocyst before the formation 

 of the ovary (Keimlager), Zeiss Obj. 1,5 mm and Comp, ocular 6. ^/g : 1. 



Fig. 11. Section through a sporocyst at the time of the localization 

 of the germinal nuclei to form the ovary. Magnification as in the last 

 figure. 



Fig. 12. Section through sporocyst in slightly later stage than in 

 the previous figure. Magnification as in last figure. 



Fig. 13. Section through ovary of fully developed sporocyst. 

 Magnification as in last figure. 



Plate 32. 



Fig. 14. Nucleus of segmentation cell in the resting condition. 



Fig. 15. Nucleus of segmentation cell in early stage of spireme 

 formation. 



Fig. 16. Nucleus of segmentation cell in later prophase. 



Fig. 17. Later prophase, first appearance of the chromatin granules. 



