Structure of the Australian Land Leech. 235 



crop (Dvt. II.). Drawn under Zeiss, C. oc. 2. 

 Col. epi. shows the long columnar cells lining 

 the duct. 



Fig. 20. Section across portion of a nephridium. Drawn under 

 Zeiss, F. oc. 2. Neph. 1, 2, 3. Lobes of the 

 nephridium corresponding to those of Fig. D. in 

 text. Bv. blood vessels. Nd. duct of neph- 

 ridium close to its opening into the vesicle, vs. 

 Nuc. nuclei in walls of the intracellular duct. 



Fig. 21. Section across part of a nephridium showing the 

 vesicle (vs.), lobes Neph. 1 and Neph. 2 and 

 blood vessel giving oft' a branch Bv. 2 to the 

 nephridium, the muscles in the wall of this 

 branch being less strongly marked than in those 

 of the main branch Bv. Drawn under Zeiss, 

 C. oc. 2. 



Fig. 22. Portion of lateral vessel to show strongly developed 

 circular muscle fibres and the small longitudinal 

 fibres. Drawn under Zeiss, F. oc. 2. 





