TREMATODES OF AUSTRALIAN IJIRDS. 217 



A dozen of these small worms were obtained from the 

 intestine of a Fairy Martin (Petrochelidon arlel), atGular 

 in New South Wales, by Dr. J. B. Oleland of the Govern- 

 ment Bureau of Microbiology, N.S.W. The worms are 

 quite small, averaging only 2 mm. long by 0*5 mm. wide. 

 The largest measured 2*19 x 0'65 mm. The body is flat 

 with the sides parallel for the greater part of the length, 

 but tapering at each end into a blunt rounded point. At 

 the anterior end the integument is covered by small half- 

 moon shaped scales. The oral sucker, which is situated on 

 the ventral side of the body, is a little longer than broad, 

 €'291 x 0*252 mm. The ventral sucker, lying in the middle 

 of the second quarter of the body length is circular in form, 

 with a diameter of 0*252, equal to the transverse diameter 

 of the oral sucker. A distinct prepharynx is present, with 

 a globular pharynx 0*112 mm. in diameter. 



There is practically no oesophagus and the intestinal limbs 

 are wide and stretch nearly to the posterior end. The 

 genital pore lies just in front of the ventral sucker, in the 

 middle line or a little to one side. The cirrus sac is very 

 elongated, C-shaped, and beginning at the anterior testis 

 curves round the ventral sucker on one side and in front 

 to reach the genital pore. 



The testes are large oval bodies placed obliquely one 

 somewhat in front of the other, the anterior, 0*31 x 0*29 

 mm. a little smaller than the posterior 0*369 x 0*29 mm. 

 The ovary which is also comparatively large, lies on one 

 side of the middle line in front of the posterior testis on a 

 level immediately behind the ventral sucker. It measures 

 0*233 x 0*175 mm., and its long axis is transversely placed. 



The yolk-glands, consisting of comparatively large oval 

 follicles 0*013 x 0*037 mm., surround the voluminous 

 intestinal limbs; anteriorly they extend to a level half-way 

 between the pharynx and the ventral sucker, and cover 



