228 S. J. JOHNSTON. 



the ventral. Pharynx conspicuous; oesophagus wanting. 

 Gonads not so close together as usual in Harmos torn una. 

 Cirrus sac rudimentary, not enclosing vesicula seminalis. 

 Field of the yolk glands extending from posterior border 

 of ventral sucker to posterior border of the ovary. Coils 

 of the ascending loop of the uterus extending laterally 

 beyond the intestinal limbs. Eggs 0*028 mm. long by 

 0*015 mm. broad. 



Host. — The Wonga Pigeon, Leucosarcia picata, North 

 Western New South Wales. 



Type specimen in the Australian Museum, No. W. 441. 



These specimens were obtained by Dr. T.Harvey Johnston 

 of the University of Queensland, at Moree in north-western 

 New SouthWales. They vary a good deal in size, the smallest 

 being 2*75 mm. long by 0*45 mm. broad, while the largest 

 measured 5 mm. long by 0*78 mm. broad, the average length 

 of half a dozen being 4 mm. The form is cylindrical, with 

 the sides of the body parallel except at the ends which are 

 somewhat pointed, especially the posterior end. Spines 

 appear to be completely absent, as I could not find any 

 trace of them either in the whole mounts or sections. 



The outline of the suckers is fairly circular and they are 

 approximately equal in size, though sometimes the oral, 

 which is on the ventral aspect of the worm, is a little 

 larger than the ventral, e.g., 0*291 mm. : 0*271 mm. The 

 suckers are a considerable distance apart, for the ventral 

 sucker stands at the beginning of the middle third of the 

 body. The pharynx is conspicuous, measuring, in the same 

 animal on which the two measurements just mentioned 

 were made, 0*135 x 0*155 mm. There is practically no 

 oesophagus, as the two intestinal limbs open directly into 

 the pharynx. The intestinal limbs show the characteristic 

 feature of Hartnostomum in the shape of the short loop 

 running forwards towards the oral sucker on each side of 



