Trematode from Protopterus. 



89 



the anterior end of the right testis. Lying to the inner side 

 of the ovary, and partly surrounding the receptaculum seminis, 

 is the cluster of cells composing the shell-gland. 



Fi<r. 2 



Heterorchis crumenifer. 



Dorsal "view of the entire animal (diagrammatic), to show the dorsal 

 excretory sac, etc. B., "bladder" of excretory vessel of left 

 side (the dotted portions of the corresponding vessel and 

 bladder on the right side are partly conjectural) ; C, intestinal 

 cfecum ; C.S., cirrus-sac ; C. P., collecting excretory vessel of 

 left side; E.Ap., aperture of excretory sac; E.S., excretory 

 sac ; O.S., oral sucker ; Oo., ovary ; P., cirrus ; Ph., pharynx ; 

 Ut., uterus ; V., vitelline glands ; Vay., vagina. 



The vitelline glands consist of somewhat large and irre- 

 gular lobes, arranged along the sides of the animal from 

 about the level of the hinder edge of the ventral sucker 



