PHYLLODISTOMUM AMERICANUM. 



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two testes are both nearly in the middle line, the anterior slightly 

 more on the left side, both are entirely within the hinder third of 

 the body. The anterior testis lies wholly posterior to the ovary, 

 unlike either P. folium where it lies on the same level as the 

 ovary, or P. patellarc where a considerable part is anterior to the 

 ovary. Both testes are very deeply and irregularly lobed, but 

 they are not divided. The lobing is deeper than in any other 

 species of the genus, in some of which (c. g., P. iiiiicinn, Odhner, 

 '02) they are entire. The cirrhus organ is present, not enveloped 

 in a sac, there is a small seminal vesicle, the ductus ejaculatorius 

 is ciliated and surrounded by prostate cells not marked off from 

 the parenchyma by a membrane. The genital pore is situated in 

 the middle line some distance in front of the ventral sucker. 



The ovary is located on the right side and in front of the 

 anterior testis (usually, but on the left side in occasional in- 



.ex. 



FlG. 4. Combined view from several serial sections showing the relation of the 

 ovary and the neighboring parts, all represented as if on the same level, X about 120. 



stances). It is deeply lobed. The oviduct arises from its dorsal 

 surface (see Fig. 4) and passes toward the anterior end. A 

 passage (Laurer's canal) is given off from the oviduct and runs to 

 the dorsal surface and right side and there opens to the exterior. 

 There is no seminal receptacle. The oviduct running on passes 

 through a distinct shell gland, receiving at this place also the 

 duct from the vitellaria ; it then passes on as the uterus arching 



