ii8 Transactions of the Royal Canadian Institute. [vol. x. 



Fig. 30. Longitudinal section of the shell glands; eod, epithelium of the 



oviduct, X 1000. 

 Fig. 31. The uterus-opening: a, from a transparency; b, from a coronal 



section before the formation of the aperture, X 100. 

 Fig. 32. The egg, showing contained embryo, X 500. 

 Fig. 33. Another, showing the escape of the oncosphere surrounded by 



the ciliated mantle, X 500. 



Plate VII. 



Fig. 34. Photograph of a transverse section through the middle of the 



scolex: ots, outer transverse muscles; h, bothrium; dvh, dorso- 



ventral muscles of the bothria. 

 F'g- 35- Transverse section through the posterior end of one of the fore- 

 most proglottides: app. auricular appendage; Idvm, lateral 



dorsoventral muscles. 

 Fig. 36. Coronal section, slightly aside from the median line, through 



the scolex and first two proglottides: ojs, oblique fibres of 



the scolex; cs, cuticular spinules. 

 Fig. 37. Similar section, in the median coronal plane: aev, anterior 



excretory vesicle; laf, longitudinally arcuate fibers of the 



scolex; mh, bothrial muscles. 

 Fig. 38. Portion of a transverse section through the cirrus-pouch: de, 



ductus ejaculatorius; ivcp, wall of the cirrus-pouch. 

 F'g- 39- Coronal sections through the vagina and its entrance, showing 



a migrating nucleus at x. 

 Fig. 40. Portion of a longitudinal section through the vagina, showing 



two nuclei at x and y leaving the epithelium. 

 F'g. 41. Another portion of the vagina, showing two nuclei passing 



through the basement membrane. Lettering as in the last 



figure. 



