November the oeroarine are Xnown to develop rapidly wi to be 

 continually escaping from the daughter r^di^e to form cysts 

 in other snails or plan Aria or to return tt. the siuae snail* 

 Since many <3er<rariie do net leave the snail but encyst Just 

 after emerging from the birth pore of the redia, sorae en- 

 cysted agamodi^torae* are certain to be formed* Also since 

 from -ept<*mber to Tevetaber ip the fall migration season, 

 it is cl^ar th^tt the cynts are formed just in time to be 

 eiten with tii 'il by lairmting duaks and geese* 



As shown by experimental feeding of encysted ^amo- 

 dia tomes to youn& ducklings, the nature adult eohincstoiaes 

 apnear in fr.ur nrVe t having it ttiis time aiacut five 

 hundred eggs in the uterus* I;i tha winter home cf the 

 duc^-s and ,;epe f numerous eg^s undoubUedly mre being given 

 off. 'iis explains- Ui^ faot th-it :|ohinQ8_toraa revt; I.utum , 

 in the v^rioua stages, oofcld be found far south, as no doubt 

 it in. 



The -*dult worms doubtless live for several years in tho 

 intestine of ths duoVs 3nd fte<*se, producing eg{;s nil the 

 The length of life of this adult echinoato^ie oculd easily 

 be determined by feedin/; the cy^ts to your^^ ducklings and 

 examining the fe^es f^ora month to month* 



Altho the :uo the r* redia* ntr>.{?;3 doubtless onn be found 

 during -my ^e^r?on r:f the year in California, ye t th^ winter 

 season is probably its dormant perio* as w*ll be proved in 

 oae of the daughter- r^diao. "Cven tho prc/bably found during 

 any season of thn yar in Californ, becaune some ducfr-s -md 

 stay the year round, yet as stated before, I should 



