bladder. Also since the muscular deBoending tubes (la), 

 have the pow*r of contraction and expannion it is obvious 

 th3t to limit the bladder to the muscular sac is not 

 correct. Also since the concretional tubes of the bladder 

 \Jd) are continuations of therauscular tubes (la), and 

 since the ascending tuoea (Xe) are directly continuous 

 with the coacretional tubes \la), then that all these 

 parts form the complete blidder seems to me to be the 

 proper conception. 



Kowhere is their found * record of the complete 

 analysis of the excretory systera of any atage of an 

 eo>iinostome. The nearest <*pproari is tiie work of Loo 89 

 (1894, fig* 191), in which he describes this system of 

 the cercaria, ^fhich he believes to belong to lohinostpma 

 revolutujQ (I !Ji a U^ ; a wa e oil in at urn ) This c^roaria, however, 

 is not the ceroaria of i!chinc8toia& reVQlutum as will be 

 proved under thediacusaion cf the adult. Aa far 'as he 

 goes, the *ller tubulea and apillfiries as well as the 

 large tubules, divisions of th<> bladder and excretory pores, 

 agree **ith th$ oercaria of ^QhincBtoata ^revolutum,. The 

 posterior part of th< excretory By stwa he fails to show 

 in detail. 'Jfhia failure cannow readily be understood because 

 of th oraaped condition of the tubules and the density 

 of the cyatogenous glands. The anterior arrangement of 



the tube* of the bladder is nearly the same as in the 

 oero^ria of ^chinos toma r evo lutunu The only difference is 



that at the anterio r end the triangiilar arrangement of the 

 tubes of the bladder as they bend to proceed posteriorly 

 la not present in Loeas 1 form. Lebour (1912, pi. XXXVIII) 



