ON AMPHILINA PARAGONOPORA 65 



the bo fly -wall at the base of the proboscis — the proboscis 

 being exposed by this means. 



(d) The Excretory System. 



Salensky has described the presence in Amphilina 

 foliacea of two lateral excretory channels (lying one on 

 each side of the body internal to the nerves) which receive 

 branches from the parenchyma. This description agrees 

 essentially with the plan of excretory system which I have 

 found in A . p a r a g o n o p o r a , and I therefore venture to 

 doubt the accuracy of Hein's account (with figures) of an 

 irregular close network of excretory channels occurring in 

 A . foliacea.^ In A . p a r a g o n o p o r a , as in A . foliacea, 

 a large excretory channel extends along the whole length of each 

 side of the body, lying immediately internal to the testes (PI. 3, 

 fig. 6). Anteriorly (PI. 4, fig. 17) each channel apparently 

 originates as a narrow channel or loop (equal in calibre to one 

 of the branches or loops given off more posteriorly) in the 

 parenchyma situated at the sides of the base of the proboscis ; 

 posteriorly the two lateral channels converge and meet in the 

 middle line in a slight dilatation (situated at about a third 

 of a millimetre from the terminal aperture — PI. 3, fig. 12, exb) 

 to form the terminal single excretory duct (ted), which in its 

 turn runs directly to open externally on the papilla (pap) 

 at the extreme posterior end of the body, the opening lying 

 adjacent to and to the left of that of the penis. In addition 

 to these two lateral main excretory channels there are four 

 series of subsidiary (as regards size) excretory channels, which 

 arise from the two lateral main channels along their entire 

 length. The first that may be mentioned comprises the 

 dorsal transverse channels (PI. 3, figs. 4, G, dtc), 

 which put the two lateral main channels into direct communica- 

 tion across the dorsal side of the body, lying between the 



^ I am aware thatCohn speaks of definite lateral channels and a net- 

 work in A. foliacea, and that Janicki figures a fine network in 

 A. liguloidea. 



NO. 265 F 



