688 



DR. F. E. BBDDAED ON 



transverse vessels compensated by any network of excretory tubes 

 pervading the medulla, such as is met with in the genera Inermi- 

 cajjsifer and Zschohkeella *. 



Text-fi^. 99. 



Sagittal section to illustrate ventral water vasculai- tube. 



V. Projecting valves, v.d. Vas deferens, v.a. Vagina. 

 T. Testes. 



* Beddard, P. Z. S. 1912, p. 596, and literature quoted there. 



