Echinostoniuni sfarzettae n. sj). 545 



terminals of tlie flner tiil)ules nor in deciding- as to tlie oiitlet of 

 tlie lateral reservoirs. 



The generative apparatiis caii be iiiore satisfactorily described, 

 '{''here are two soniewliat irregulär or lobulated roimded testes lyiiig" 

 posteriorly in tlie median line »me beliind tlie other. They measure 

 about .6 mm in diameter and eacli gives off anteriorly a delicate 

 vas deferens wbicli runs forward to tlie cirrus sac uniting with 

 its fellow just before it reaclies tlie sac. The cirrus sac is a pear- 

 shaped structure of connective tissue opening' anteriorly into tlie 

 posterior dorsal angle of the cloaca whicli also receives the uterus 

 and which as stated above opens just anterior to and above the 

 ventral sucker. Tliis sac encloses another sac filled with spermato- 

 zoa and iramediately surrounded by smooth muscle-fibres. Outside 

 of this there is a mass of large cells with large vesicular nuclei 

 — anteriorly this inner sac passes into the thick cuticle-lined 

 ejaculalory duct which opens directly into the cloaca. This is so 

 tortuous that it is apparently quite long and roughened internally 

 by fissures in the cuticle — possibly the roughening is more 

 apparent when it is everted: surrounding the duct are many small 

 secretory cells. 



The ovary which is rather smaller than the lobes of the testis 

 lies a little to one side in front of the testes and gives off from the 

 middle of its posterior surface an oviduct with folded and ciliated 

 wall which runs obliquely upw^ard and backw^ard to meet the some- 

 what tortuous Lauker's canal which has been already mentioned. 

 The resulting thick-walled tube continues dorsalwards embedded 

 deeply in a mass of large cells with large vesicular nuclei — the 

 Shell gland. — It soon receives the wide anterior Prolongation from 

 the Union of the conducting trunks from the vitellarium — one from 

 each side. Simultaneously it gives off the thick muscular tube which 

 is the begining of the uterus and which soon widens and becoming 

 abnndantly convoluted and filled with eggs occupies a large portion 

 of the middle of the body bet^veen the ovary and ventral sucker. 

 Near its begining this tube has a muscular diverticulnm wiiich is 

 filled with spermatozoa. T^ike the cirrus sac the uterus opens 

 anteriorly in front of the acetabulum in the genital cloaca. It is 

 wide and thin-wailed up to the region of the acetabulum wliere it 

 becomes a narrow thick-walled tube lined with cuticle. The eggs 

 are elliptical in form with a fairly thick siiell and measure about 

 .1 — .11 mm in lenyth bv .üö— .004 mm in breadtli. 



