276 1"H. MONTGOMERY, On the structure of the nephridia of Stichostemma. 



Fig. 7. Section through terminal bulb and the proximal end of 

 its ductule. Oc. 4, tube extended. 



Pig. 8. Part of a transverse section through the dorso-lateral 

 segment of the body wall, showing a portion of the main duct, and a 

 whole excretory duct. Oc. 2. 



Fig. 9. Diagram illustrating the arrangement of the nephridia, 

 constructed from the examination of the individual which was the basis 

 for my results in regard to the distribution of these organs. The dotted 

 line represents the outline of the worm. The heavy black lines are 

 the main ducts of the nephridia, and this construction shows their 

 relative lengths as accurately as possible ; but in this figure their ventral 

 branches are not distinguished from the dorsal. The colored transverse 

 lines refer to the excretory ducts: the red, to those situated above the 

 nerve-chords, the green, to those below it. The small marginal numbers 

 refer to the excretory ducts, and the roman numerals to the main ducts 

 of the nephridia. I have not attempted to reproduce the relative 

 distances between the excretory ducts of one and the same nephridium, 

 but have simply drawn for each its correct number of excretory ducts. 



