TREMATODES OF AUSTRALIAN BIRDS. 203- 



The oral sucker is small and globular, 0*15 mm. in 

 diameter. The ventral sucker, which is rather more than 

 its own length behind the oral, is 0*62 mm. long by 0*52 mm. 

 broad, so that the ratio of the oral to the ventral sucker 

 is 1 : 4. The pharynx is 0*194 x 0*097 mm. and the oeso- 

 phagus 0*388 mm. long. The intestinal fork lies just in 

 front of the ventral sucker. The intestinal limbs end 0*388 

 mm. from the posterior extremity. 



The genital pore lies a little behind the intestinal fork 

 on the ventral surface, in the area dorsal to the anterior 

 part of the ventral sucker. The cirrus sac is pear-shaped 

 and extends back as far as the middle of the ventral sucker. 

 The testes, elliptical in shape, are equal in size, and 

 measure 0*582 x 0*252 mm. They lie very close together, 

 one behind the other in the middle line. They lie aproxi- 

 mately in the middle of the body. The ovary is nearly 

 globular in shape 0*16 X 0*19 mm., and lies on the right 

 side of the middle line, a short distance in front of the 

 testes, with the gland of Mehlis directly behind it. 



The yolk-glands consist of rather large, oval follicles 

 0'037 - 0*043 mm. long by 0*032 mm. broad. In front they 

 do not extend as far forward as the ventral sucker, and 

 behind the testes completely surround the intestinal limbs 

 on each side, leaving for the most part a clear space in the 

 middle. In the region of the testes and in front of this 

 they are entirely confined to the lateral fields between the 

 intestinal limbs and the sides of the body. 



The uterus is short and contains in each specimen only a 

 few large eggs. The eggs are rather variable in size, and 

 in those of three specimens measured 0*096-0*107 mm. 

 long by 0*058 - 0*064 mm. broad, but in the fourth specimen 

 they were considerably broader and measured 0*107 mm. 

 long by 0*08 mm. broad. 



This species differs from E chin o par yphium agnatum, 

 Dietz, in being much larger, in its much more markedly 



