138 PLATYHELMINTHES. 



jaundice lead on to death. The life-history clearly shows 



the reason why sheep incur this disease after grazing on 



damp pastures. 



At the anterior end is a blunt cone, at the tip of which 



opens the mouth in the centre of a sucker. 



The body tapers from two shoulders to a point. 



In the mid-ventral line, about y^th of its total 



length from the anterior end, is situated a second sucker. 



The body is of a dull yellow colour and enveloped in 



, +„ ^«+„^„ a thin cuticle, which forms hook-like pro- 

 Integumentary. .' . . ,, J J 

 cesses or spinuks pointmg backwards and 



scattered over the surface. 



Fig. 70. — Transverse Section through the Liver-Fluke. 



{Distonntffi.) 



(Somewhat diagramnialic.) 



Longitudinal Vas Deferens. 



Muscle. \ Circular Muscles. Ovary. Ectoderm. 



Parenchyma. " «. _ 



Cuticle. 

 Intestine. Excretory Nerve Cord. 



The animal creeps about slowly by muscular contrac- 

 tions. Under the cuticle are formed well-defined circular 

 and longitudinal layers of muscles. The mouth leads into 

 a sucking pharynx with muscular walls. This 

 opens backwards by a short oesophagus into a 

 large intestine. The intestine forks into two main branches 

 which run back to the hind end of the body. On their 

 outer side they give off a great number of much-branched 

 processes which end blindly at the edge of the body. 

 Digestion appears to be purely intra-cellular. There is 

 no anus. 



