On Dissotrema papillatum. ]n 



Seminal receptacle large, flask-shaped, between ovary and right 

 testis; Laurer's canal present, opening on the dorsal side in 'left 

 half of body. Vitellarium extending from level of genital pore 

 forwards to between the oral sucker and prepharyngeal convolu- 

 tions, situated around the digestive tract; two yolk ducts proceed- 

 ing backwards on either side from hind end of vitellarium, they 

 soon unite to form the paired yolk ducts; yolk reservoir sub- 

 median, midway between testes and penis sac. Eggs asymmetric- 

 al, with a short, blunt stalk-like projection at one end. Excretory 

 vesicle opening on top of the papilla above mentioned, extending 

 forwards a little farther than middle of acetabulum ; main excretory 

 vessel reaching forwards to about the level of the brain, where it 

 turns backwards to form the recurrent vessel. 

 Host. Siganus fuscescens (Houttuyn). 



