BY T. HARVEV JOHNSTON, >f A.. D.SC. 71 



apipearance of the anterior end is shown in Fig. 5. The 

 width is fairly uniform (-7 mm.) throughout the greater 

 jJart of its length, the broadest portion being anterior 

 (1-4 mm.) The length varies somewhat, some of the 

 complete specimens examined measuring 47 mm. The 

 piosterior end is rounded (Fig. 6), and bears the excretory 

 pore lying at the base of a small depression. The body 

 is imperfectly ringed, and the cuticle is also thrown into 

 small folds. 



Calcareous corpuscles are abundant. The longitudinal 

 muscles are arranged in a series of well-marked bundles. 

 The excretorj^ canals lie deeply, each being distant from 

 the margin about a third of the body diameter. They join 

 near the posterior end to form a very short common tube 

 terminating at the excretory pore. The nervous system 

 consists of a small mass just behind the slit-like depression 

 at the anterior end, and of a pair of prominent laterally 

 situated strands, as well as a pair of longitudinal nerves. 



Fasciola hepatica, L. 

 Specimens of the common liver fluke were forwarded 

 from Ipswich, having been taken from sheep and cattle. 

 Heterakis chenonettce, n. sp. 



(PI. IV ; Figs. 31, 33). 



Last year, I took from the caecum of a wood duck 

 Chenomtta jitbata, near Sydney, a number of specimens 

 of a small Heterakis, which appear to belong to a new species. 

 The dimensions are : — Male — length, 6.8 mm. ; breadth, 

 •19 mm. ; female — length, 7-7 mm. ; breadth, -26 mm. 

 This species is thus slightly longer than H. hancrofti. 



The cuticle bears very fine annulations. The anterior 

 end tapers rather rapidly from region of the nerve ring, 

 while the posterior portion of the worm becomes gradually 

 narrowed to terminate in small fine tail. The lips are 

 equal in size, but are small. The excretory pore lies at 

 •422 mm. from the head end, in the same region as the 

 nerve ring. The vulva is situated just behind the middle 

 of the body (4-2 mm. behind the head). The anus in the 

 female lies at .53 mm. from the posterior end. 



The tail of the male terminates in a fine point. The 

 al?e are prominent and bear nine pair of papillae, whose 

 position is indicated in Fig. 30. Four pair are pre- anal 



