TREMATODES OF AUSTRALIAN BIRDS. 221 



Integument spiny. Suckers equal in size; the ventral far 

 back in the posterior region of the body. Very long pre- 

 pharynx and oesophagus. Intestinal limbs moderately long, 

 wavy, ivithout diverticula. Genital pore on a level with 

 the ventral sucker on the left side. 



Testes symmetrically placed, one on either side, behind 

 the ventral sucker. Ovary on a level with the ventral 

 sucker. Eggs very small. 



Host. — Characlrius dominions, in the caecum. 



Type specimen in the Australian Museum, Sydney, No. 

 W. 437. 



A very large number of these minute worms were obtained 

 by Dr. Harvey Johnston from the caecum of Charadrius 

 dominions at Lord Howe Island. They vary in length from 

 0*77 to 1*07 mm. 



The specimen from which figure 13 was drawn, which is 

 fairly typical in size and shape, except that the body is a 

 little wider than usual in the region of the intestinal bifur- 

 cation, measured 0*97 mm. long by 0*194 mm. wide at the 

 level of the pharynx and 0*368 mm. in the widest part of 

 the body, in the region of the testes. The worms are 

 elongated pear-shaped, and flattened dorso-ventrally. The 

 integument in the anterior part of the body in front of the 

 intestinal fork is densely covered by small spines. 



From that level they gradually become more scattered 

 right back to the posterior end. The oral sucker is situated 

 on the ventral surface at the narrow end of the body; the 

 ventral sucker is far back, lying in the posterior quarter of 

 the body length. Both the suckers are circular in form 

 and exactly equal in size, varying from 0*064 to 0*074 mm. 

 in diameter. The pharynx is well marked, and owing to 

 its isolated position, a conspicuous structure in whole 

 mounts. It measures 0*018 X 0'042 mm. In front of it 



