88 



PARASITES OF MAN 



neighbourhood of the hook-fangs. They are equally present 

 and abundant in the pork measle proper, and in measles derived 

 from the human subject. The cephalic hooks of this cestode 

 are comparatively large, those of the greater circle individually 

 measuring ^" t whilst the smaller hooks have a length of about 



FIG. 28. Head of Tania tolium. Highly magnified. Afier Van Reneden. 



The male reproductive organ consists of a number of small 

 vesicles or sacs, in which filiform spermatozoa have been 

 detected, these latter, when ripe, being conducted by a vas 

 deferens into a seminal pouch, from which a canal passes 

 laterally into the penis ; the latter organ, in its retracted con- 

 dition, being lodged within a flask-shaped sheath or cirrhus- 

 pouch. The female organs are somewhat more complicated. 

 They consist of two masses of vitelligene glands occupying a 

 limited space, a small ovarium, a centrally -placed and largely- 

 developed branched uterus, canals of outlet leading from all 

 these organs, and enlargements of the main passages to form 

 internal seminal reservoirs ; also, a vaginal canal, which is 

 widened at its termination to form a receptaculum for the 

 curved penis. 



