Japanese Tricladida Mari cola. ^y 



to the longitudinal nerves in front of the penis Fam, Bdellonrido?. 



J. Ectoparasitic on Limultis. Body with a distinct adhesive disc at the head 

 end. 



a. Eeceptacnlnm serninis saccular ; duct arising from its anterior edge. In- 



testinal branches numbering 24-32 Genus BdeUoura. 



b. Keceptaculum serninis closely similar in appearance to the preceding ; duct 



arising from its posterior inner surface. Posterior gut trunks uniting 



soon after hatching and forming an unpaired stem. 



Genus Sijiicoelidhnii. 



r>. Freely living. Body witliout any sign of adhesive disc. Eeceptaculura 

 seminis tubular Genus Sipisijihouiiun. 



