TREMATODES OF AUSTRALIAN BIRDS. 



207 



Type specimen in the Australian Museum, Sydney, No. 

 W. 431. 



I obtained a large number of specimens of this little 

 worm from the intestines of the Shag or black and white 

 cormorant Phalacrocorax melanoleucus, near the Tuggerah 

 Lakes, New South Wales. 



It is a small form and varied little in size, the smallest 

 measured being 3*134 mm. long by 0*52 mm. broad, the 

 largest 4*05 mm. long by 0*59 mm. broad, while the average 

 of a large number measured was 3*16 x 0*503 mm. It is 

 a, rather delicate and slender form, broadest in the region 

 of the ventral sucker. Behind this it becomes somewhat 

 narrowed, and then gradually increases in width up to the 

 region of the anterior testes, so that this region forms a 

 kind of waist; behind this the sides of the body are fairly 

 parallel till near the posterior end which becomes fairly 

 suddenly rounded off. Between the head collar and the 

 ventral sucker the body is slender, so that a very distinct, 

 slender neck is present. On the ventral surface the neck 

 region is fairly deeply concave. The integument is fairly 

 thickly beset with small spines in the anterior part of the 



body. Beginning at the 

 extreme anterior end, 

 these spines are very 

 numerous down to the 

 level of the ventral 

 sucker, where they 

 begin to thin out, and 

 entirely vanish at the 

 level of the ovary. 



The head collar is well 

 marked, with somewhat 

 prominent ventral lobes 



Fig. 10.— Head collar and spines of 

 JHchinochasraus tenuicollis. 



or angles. It bears 



