INVEBTEBRATA. 



357 



open into the shell- gland, which is in front of them. The 

 ovary is of limited extent and consists of a branched tubu- 

 lar structure, the blind ends of the tubes being somewhat 

 dilated. It is situated on the right side of the body in 



PENIS 



OVARY 



UTERUS 



RIGHT 



VAS" 



OEFERENS 



SHELL 

 GLAND 



WITELLINE 

 /'GLANDS 



Fig. 186. DIAGRAM OP QKNERATIVK OROANS IN FASCIOLA HKPATICA. 



front of the transverse vitelline duct. The single terminal 

 oviduct opens into the shell-gland. The shell-gland is a 

 small spherical structure in the middle of the body behind 

 the ventral sucker ; it is composed of a number of unicellular 

 glands secreting into a central cavity j the secretion forms 



