ON DIPLOZOOX NIPPONICUM, N. SP. 189 



Explanation of Figures. 



Abbreviations common to all the figures. 



as ascending stem of the excretory vessel (according to the 



direction in which the contained fluid moves). 



hv brain. 



cc connecting canal between the oviduct and the intestine. 



dem dorso- ventral muscle. 



ds descending stem of the excretory vessel. 



dc digestive cell. 



eo excretory opening. 



int intestine. 



mce external circular muscle ] 



, [ of the phai-yiif'-eal wall. 



mci internal ,, ,, i 



mo mouth. 



nae external anterior nerve. 



nai internal anterior nerve. 



nv ventral nerve. 



nvl ventro- lateral nerve. 



ov ovary. 



ovd oviduct. 



oe oesophagus. 



ph pharynx. 



pph prepharynx. 



