33 



sporocyst, within which, by the first asexual generation, a new 

 form of individual is developed, having a well-marked digestive 

 tract, and blunt processes for propulsion. This is known as the 

 Redia. The Redia in its fully developed state, gives rise by 

 the second asexual generation to still another intermediate 

 form, from which at length the sexually mature flukes are 

 developed within a suitable host. 



Diagrams of the Bilharzia, were shown, the two sexes being 

 quite distinct. The habits of the worm, and its great danger 

 to man owing to its invasion of the veins of the bladder, with 

 consequent production of Hematuria, were dealt with. 



Of the third family (Nematoda), Oxyuris, Ascaris Lutnbri- 

 coides, Trichina Spiralis, and Ankylostoma Duodenalis were taken 

 as examples. Specimens of all were shown. 



The Trichina is usually introduced into man in the encysted 

 form, through eating "measly"' pork. The embryos are set 

 free in the stomach, bore their way through the intestinal wall, 

 and are conveyed by the blood-vessels to the muscles, where 

 they encyst themselves, giving rise to much pain and trouble. 



The Ankylostoma is chiefly noted for its giving rise to what 

 has been termed "miners' disease," this consists of a profound 

 anaemia, with pains in the stomach, and haemorrhages from the 

 bowels. It is hardly known in this country, but last year an 

 outbreak occurred at Dolcoath, in Cornwall, and was shown to 

 be due to this parasite. The worms cling to the inner coat of 

 the Duodenum, and seem to act like leeches. They are very 

 small, being but \ to J inch in length, but are capable of 

 causing great damage. 



