TREMATODES OF AUSTRALIAN BIRDrf. 215 



spatula-like in form, rather less than a millimetre long, 

 and a little more than one-third of a millimetre broad. 



The largest specimen measured was 0*99 mm. long, and 

 0*39 mm. broad, while the smallest was 0*815 mm. long, 

 and 0*349 mm. broad. The body reaches its greatest 

 breadth in the region of the testes and is very bluntly 

 pointed at each end. 



The integument at the anterior end is thickly covered by 

 small, backwardly directed spines. The suckers are com- 

 paratively large, especially the oral (0*161 mm. in diameter) 

 which is considerably larger than the ventral (0*133 mm.). 

 The pharynx is also comparatively large (0*075 mm.) and 

 muscular, but the oesophagus is very short. From its 

 posterior end the limbs of the intestine run out towards the 

 sides for some distance, then bend sharply through a right- 

 angle and course backwards parallel to the lateral edges of 

 the body, ending a short distance in front of the posterior 

 end. 



The excretory pore is placed at the extremity of the 

 body and leads into an elongated vesicle which runs for- 

 wards, passing between the testes on the dorsal side of the 

 body. At about the level of the ovary it bifurcates into 

 two branches. 



The genital pore lies just in front of the ventral sucker T 

 near the middle line. The testes are equal in size, large 

 and oval 0*138 mm. long, and 0*117 mm. broad. They are 

 obliquely placed one behind the other, the right being 

 posterior. The ovary is nearly spherical and smaller than 

 the testes, 0*085 mm. in diameter, lying on the right side, 

 at a level just in front of the anterior testis but behind 

 the ventral sucker. 



The cirrus sac is very elongated and tubular, extending 

 from the anterior testis to the genital opening, curving 

 round on the dorsal and rii2fht side of the ventral sucker. 



