112 AUSTRALIAN ENTOZOA, III., 



HOLOSTOMUM SIMPLEX, sp.ll. 



(Plate vii., figs. 1-3.) 



Length 3-5 mm.; the cylindrical posterior region narrower than 

 the anterior and gradually tapering backwards; anterior region 

 0-68 mm. long, posterior 2-8 mm. 



The clinging plug is very simple in form, being in the form of 

 a flat lamella folded along its median, ventral, longitudinal line 

 into two folds (PI. vii., fig. 3), which project a little way beyond 

 the cup. The oral and ventral suckers are large and equal in size 

 (0-18 mm. diameter); the pharynx is much smaller. 



The ovary is situated about the middle of the posterior body- 

 region, oval or elliptical, with the long axis in a dorsi-ventral 

 direction. The main chambers of the uterus are situated in front 

 of the ovary ; it then runs backwards as an uncoiled tube along 

 the ventral body-wall. The vitelline glands extend into the 

 anterior body-region and into the plug, and right back along the 

 ventral wall to the extreme posterior end. Testes large, and 

 divided up into a number of lobes. The male and female ducts 

 join to form a common genital duct which traverses the genital 

 papilla and opens on its extremity. 



Found in the intestine of the Blue Crane, Ardea noire-hollandice, 

 Lath., at Creel Bay, Broken Bay. 



HOLOSTOMUM MUSCULOSUM, sp.n. 



(Plate vii., figs. 4-9.) 



Length 11 mm.; anterior region 1'2 mm., posterior 9-8 mm. 



Anterior and posterior body-regions well marked off from one 

 another. The anterior region is much shorter than the posterior 

 region; the hinder part of the dorsal aspect of the anterior body- 

 region presents to view two rounded elevations. The posterior 

 body-region is circular in transverse section and gradually 

 increases in diameter towards the posterior end, the rate of 

 increase becoming greater in the region of the bursa copulatrix. 



The clinging apparatus is especially complicated. It consists 

 of a number of processes projecting into the cavity of the cup, 



