35. 



and 

 described by Looss (18&4), Lebour il918) f /0ort (191k) and from 



of gcliino gtjpia/j. revo 1 tit turn. Jbnuf-t jaakeo the following 

 stateraont GO no em in excretory syt-teia of echinesteraes. 



"This* fwnily of ci^ tomes is oh j raoteri? T ed by simplicity 

 of det.'v. 1 in the excretory system exoept at the head of 

 the ::niri lateral v<?3al n . 3?rom my study rt the oercaria 

 cf /?chino?3toma reyolutura I ara inol ined to thin> t)r*t. just 

 the cp-pcsit is true. Certainly it is y*?ry oornplox in th4s 

 on -ies an<t sinoe th^ exoretory system is so conseryative 



I o'in hardly betliovo Ui ^ocies of the Dohino&toraiaae 

 differ muoh on fund oriental points. 1 tyfin yonture that when 

 this system is ntudi^a in detail in wor** eohinostoraas 



^i nvrt^tlfl^bient of parts mil be found to bo quite 

 pattern. v *. 



The parts of th^ excretory gyt/4 'found in the tail 



ciqa reyo lut g^ > altho very iraple in arrangement 



found h-ird to wor>" out on acaount of -the deceptive 



of the m.UB01ea in tiii? region. This part of the 

 axoretory system of ^chinogtofa:! i e. vo lut iua a^ r e e a -vith the 

 description by LOOESS (1894, fig. !'.'!), by labour (1912, 

 pi. .ai, figs. , 15, 17) and by Gort (1915, fitsa. 39 

 and 43). This may^s a total of at 1 ~~ast f?even eciiinostom^ft 



Ting this nh-Titv^tflriatio arrangem mt of th bladder 

 tubules in the tail of the eeroari^e. The fcur eohinostonie 

 oeroariae described by Biuat differ decidedly on this 

 char-moteristio froia any of the above- They alno differ 

 much from ^aoh oUier. He shows none of them with excretory 

 poree in the tail. The excretory system in the? tail of 

 Oercaria triso Ignata is shown as a single, tube. In comparison 



