BY T. HARVEY JOHNSTON, M,A., D.SC. 7B 



The male spicules are equal and relatively long (-860 

 mm.), sharp- pointed structures, the points being turned 

 backwardly. Their form is indicated in Fig. 30. The 

 sucker is chitinised and possesses a diameter of -073 mm. 

 Its posterior margin is situated at about -035 mm. in front 

 of the cloaca. L>'ing between it and the cloaca is a pair 

 of pre- anal papillae. The disposition of the papillae around 

 the lobed alae is indicated in the figure, there being two pair 

 placed pre-anally, two pair post-anally, and two pair 

 just near the junction of the alae with the narrow pointed 

 tail. 



This species is associated with the name of Dr. T. L. 

 Bancroft, who has rendered me considerable service in 

 regard to material. 



Heterakis catheturinus, n. sp. 



(PL III; Figs. 23, 25. PI. IV; Figs. 26, 27). 



As already mentioned, this large species may some- 

 times be found in company with the commoner species* 

 H. bancrofti, infesting Catheturus lathami. My specimens 

 have been collected from material forwarded by Dr. T. L, 

 Bancroft from the Burnett River. Adult females may 

 reach a length of 28 mm., males being somewhat shorter 

 and attaining a length of 21 mm. 



The anterior end is rounded and narrow, while the 

 posterior extremity terminates in a short pointed tail in 

 both sexes. The three lips are equal in size, their 

 characters being indicated in Fig. 24. The excretory 

 aperture lies at a distance of -8 mm. behind the mouth. 

 The vulva is situated at about the middle of the body 

 length, on a slight elevation. The anus is distant from the 

 posterior extremity -40 mm. in the case of the male, and 

 •86 mm. in the case of the female. At each side of the 

 anterior end of the parasite, there is a ridge or ala, arising 

 laterally just behind the mouth and travelling backwards 

 for about two millimetres. The cuticle bears fine trans- 

 verse rings. 



The alimentary canal is of the usual type, and is 

 surrounded at -50 mm. behind the mouth by the nerve 

 ring. 



