1876.] Lewis and McConiiell — On a New Parasite affecting Man. 185 



radiating muscular iibres. Its orifice is about -^oi^ of an inch in transverse 

 diameter, but yV when the measurement is taken from the outer margin 

 of the rim forming the sucker. In the adjoining figure a vertical section 

 of this sucker may be observed. 



In this drawing the anatomy of the entozoon may also be studied 

 as viewed from the ventral surface. The parasite is represented as magni- 

 fied 12 diameters. Commencing vdth the oral sucker («) we find it to 

 consist of a transversely placed oval orifice, suii-ounded by a ring of 

 muscular tissue and presenting in many specimens a slight, papilla-like 

 prominence. The orifice leads to a bidbous heart- shaj^ed j)harynx — with 

 the apex directed anteriorly (h). At the lower margin the Nervotis 

 ganglia (c) may be recognised — the ganglia of one side communicating 

 with those of the other by mieans of a comparatively strong cord passing 

 transversely behind the oesophagus. Nervous filaments are given of£ which 

 spread in all directions, of which the largest are the cords (Ji) which may 

 be traced along the ventral sui'face. of the two intestinal canals. 



AMPHISTOMA. HOMINIS.--Lorif,'itudinal Section. xl2. 



The (EsOj}J/agus (d) is ^\" or ^y in length, bifurcates behind the geni- 

 tal pore — generally a little above the level of this aperture, but sometimes 



