STRUCTURE OF THE NEPHRIDIA OF DINOPHILUS. 545 



Fig. 9. — Termiual portion of the third nephridium. 



Fig. 10. — Tlie third nephridium. 



Fig. 11. — A transverse section through the region of the vesiculffi. 



Fig. 12. — A transverse section through tlie region posterior to the stnmacli, 

 showing the testis surrounding the gut. 



Fig. 13. — Transverse section through the region of the junction of the 

 gut with the stomach. 



Fig. 14. — Longitudinal coronal section in a plane slightly below the middle 

 of the stomach. 



Fig. 15. — Transverse section through the region of the pharynx. 



Fig. 1G. — The third nephridium. 



PLATE 30. 

 Fig. 17. — A general diagrammatic figure showing all the nephridia. 



