38. 



eercarine of hinoajtomura revo lutuoi m- *2.i..8tc mum erjliin .turn 1 * 



a*? described b$ Loosg. But even in Qercaria bif ley a I am 

 inclined to believe th-it t/;-? tubule to which the thre 

 anterior flam cells :*re attached does not bend forward 

 and join the tube of the bladder but proceeds much farther 

 posteriorly, joining tho tube of thf^bl <dder in the region 

 of the acetabulure (fig* 47, 2a) . i'he f in ^ capillaries shewn 

 in C^rca^i^ bjflexa (i'aust, 1917, fi 3 -b) joining tJie tubes 

 of the bl'Ad-ifrr is an iaaprcbable arrangement aloo 'ihese 



. illaries are probably equivalent to the branoning of the 

 tubes of the bladder as sho^rn by Labour (1912, pi. XXVII 1, 



* 9. 13 t 17). 



^onc^rning any of the oritioiams of Bust's ^or) r , I 



will say in fairness to him, thn.t sino<? none of his ppeoies 



i vi 



h?v~ bee i studied, 1 may have carried nay criticism*? based 

 on comparison too far* It must be said, however, that his 

 arrangement of the excretory parts Tiolateo some of the most 

 fundamental homologiee of excretory systems* Alee since 

 ofoufit's detail is so lacking, the conclusion is reached 

 that he really did not completely solve the pattern of the 

 excretory system of any one of the four eohinostcme cereari'ie* 



'iie cause of the numerous flame cells, the complexity of 

 the arrangement of the collecting tubules and accessory 

 collecting tubules md the definite arrangement into 

 capillary groups throout the body, it seeraa quite probable 

 that tiie excretory system of the eohinostorae cercariae re- 

 presents much more closely the adult condition than che 

 condition found in the schistosomes or fork-tailed cercariae, 



e th fla^e cells irise singly, -ire few in number and 



