44. 



of these rediae, however, **<re almost lifeless and of a 

 dirk brown color* In the rediae with the cysts were some- 

 times found actiTe oeroari ie nearly ready to escape and 

 gem balls of different sises. 



encysted a^avicdi^torae is net specific tc l ; ;hyea 

 ig since onae Z found it in Iranaea 



Also out of twenty planariae t3.Ve:i from the sRtae roo) r s as 

 the snails, <3ix contained cysts, one having seventeen 

 embedded in its muscular tissue and another 1 0u 



other four, however, had only one, tvw . or three oy^ts. 



Leeches . tn)- en from th*5 O3a ro<5)'n gave negative results 



as di tidT)ol9 of ily.la regilla p Baird and Oirard and 



N.o.tOjpji T tji%l:Maus torcsus (Hath^e), into whose aqutria active 

 ceror>ria wre plaoed. I prdiot thut a thorough canvas* 

 cf ''tow .baVe or other pla^^s ^h^re this oeroaria i found 

 would reve-il r. Uir ho0t& for this rtag9 j^iis laoJ- of 

 specificity of Ui^oncyated a?camodistorae io quite nommcn in 

 dige'ieti^ -reraatode^i ?nd is what one expects since they are 

 in the passive state* 



There are at least four ways in whioh the cyr.t may be 

 tn>em into the primary host* The first and peritaps the 

 usual way is *vnen the infected snails beir^i eal^eri 1 ^y 



se, etc. MoAt^e (1918) report after a careful 



study of th'* food habit* of seventeen hundred ?ind twenty five 



of the food 

 mallard ducV-s of Uie United States that 9.47 por cent/oc;nsits 



of animal matter. He says, "i&ollusya, the niost important 

 element of animal food of the mallard, oonprise thrne-iifths 

 cf this ind 5. 7^5 per cent cf the total. #resh water snidls 

 are represented most numerously no fewer than fifty sometimes 



