48. 



sometimes live longer th;m six weeks in dead snails and Dm 

 surrounding water medium. However, for the majority their 

 life was about five wek0 That tne length of life would 

 be twice as lon^ if in the open pond or stream, I do not 

 doubt in the least* Those results substantiate the previous 

 belief thix oy>i,p are quite harty and long lived* Since 



this echmoatome cannot encyst in water, it aeons that any 



'< . 



cysts that '*t to the bcLtoia of the pond must survive the 

 deony of the snul. 



I r04jt, 13 f, 



Adult 



t 

 Sin^e th^ adult, 'dJohinostoma revolutusi. has been well 



described by Loo^s (1899), I*uh (1909), u>ietx (1910) and 

 others, v<?ry little description of this stage will be 

 given. 



Ane adults of foh in o B tom?^ r r? YC 1 u t urn, as previously 

 stited, w^re obtained in two ways, firrtt* by exsawining 

 different speoies of wat*ir birds ooramcnly found on the l^e 

 froia which t)ie snail, ?hy aa O T o oi den. t al i a . was tn>-en One 

 species of duQ)% Mfirila ma rjl la was found to ccntain three 

 adult ecriinos tomes in its intestine* rhese adults survived 

 about, fifty -five nours in the intestine of the duo>-, ,ind 

 twenty -four hours in ncrioal salt solution. During the last 

 twenty -four Jiours about forty-five egga were produced w}iidh 

 were inoubaled and traoed to the full-grown miracidia st:igo 

 The second me'ttiod of obtaining adults was by feeding the 

 noyated agaraodistoiaes (cy^ta) found in jffiffga occi dental is to 

 mongrel ducVlinga which were carefully protected froia other 

 treraatode infections, in this way, eight full grown wo 



