TKEMATODES OF AUSTEALIAN BIKDS. 219 



pharynx and oesophagus present. Intestinal limbs wide 

 and voluminous. Genital pore just in front of ventral 

 sucker. Cirrus-sac long and wide containing a voluminous 

 vesicula seminalis constricted in its middle. Ovary some 

 distance behind the ventral sucker. Testes one behind the 

 other, in the posterior body-third. Yolk-gland extending 

 from ventral sucker to end of intestinal limbs, not extend- 

 ing inwards beyond the intestinal limbs. 



Host. — Phalacrocorax melanoleucus, in the intestine. 



Type specimen in the Australian Museum, Sydney, No. 

 W. 438. 



A single specimen of this little worm was found in the 

 intestine of a shag, Phcdacrocorax melanoleucus at Tug- 

 gerah Lakes. It is only 1*1 mm. long and 0'184 mm. broad. 

 It is cylindrical in shape, of even diameter throughout 

 almost its whole length, being bluntly rounded off at each 

 end. The anterior part of the body as far back as the 

 ** shell-gland " is densely covered with small spines. Behind 

 the "shell-gland" they become a little less dense, and end 

 abruptly at the level of the anterior testis. The oral 

 sucker is circular in form and comparatively very large* 

 almost as wide as the body. Its diameter is 0*1602 mm. 

 The ventral sucker also circular, is situated in the beginning 

 of the middle third of the body. Its diameter is 0*1068, so 

 that the ratio of the oral to the ventral sucker is 3 : 2. 



There is a very distinct prepharynx, 0'032 mm. long. The 

 pharynx is globular, with thick muscular walls, and has a 

 length of 0*064 mm. The oesophagus 0*032 mm. long is only 

 half as long as the pharynx. The intestinal limbs are wide 

 (0*048 mm.) and voluminous, and run back to the posterior 

 end of the body, nearer to the middle line than to the sides 

 of the body. 



The cirrus sac is long (0*24 mm.) and wide, and contains 

 a voluminous vesicula seminalis, constricted in its middle. 



