200 



ENTOZOA. 



The surface of the body is smooth in this region, but immediately 

 below the ventral sucker the epidermis has a minutely tuberculated, 

 warty aspect, which is continued onwards to the point of the tail. 

 The pharynx is apparently unprovided with any special pouch, and 

 there is no oesophageal bulb ; the tube bifurcates immediately above 

 the ventral sucker, and these divisions passing on towards the 

 region of the tail, reunite in the central line. The same thing 

 occurs in the female, the point of union taking place much higher 



Fi&. 44 — Bilharzia hcematohia, Cobbold ; male and female, the latter partly enclosed within 

 the gyncecophoric canal. Considerably magnified. — Kuchenmeister. 



up in the body, and producing a long, tortuous, broad, and twisted 

 central canal, which is continued to near the tip of the tail, where 

 it terminates coecally. The testes appear to consist of several 

 distinct lobes, or small oval organs, which are probably con- 

 nected to a pair of vaso^ deferentia, opening externally by a single 

 outlet below the ventral sucker. There is no evidence as to the 

 existence either of a seminal pouch, or intromittent organ. In the 

 female the viteUigene glands are situated, one on each side of the 

 central intestinal pouch, whilst the egg-shaped ovary occurs near 

 the point of junction where the intestinal divisions unite. From 

 its posterior margin a germ- duct is given off, which unites with the 

 ducts coming from the viteUigene glands ; and these together 

 forming the oviduct are continued forward as a single uterine canal 



