TVENIA SAGINATA 65 



has no booklets, and usually there is a deposit of black 

 pigment in the anterior part of the head, which gives 

 a dark appearance to it as seen with the naked eye. 

 Sometimes the amount of this pigment is so great that 

 some specimens have been called T. nigroccphala. 



The proglottides, when sexually mature, can be dis- 

 tinguished from those of T. solium, as the ovary on the 

 same side as the genital pore is not perforated or divided 

 by the vagina (figs. 32 and 33). The mature proglottides, 



FIG. 33. Proglottis of Tienia saginata, with genital organs. Note that 

 the vagina, v, passes round the left ovary and not through it. 



distended with eggs, show far more numerous (twenty to 

 twenty-five) and much branched diverticula (figs. 34 

 and 35). The eggs are slightly more oval. 



The cysticercoid form is found in the ox, usually in 

 the muscles, and is known as Cysticercus boms. It is 

 about 8 mm. by 5 to 6 mm. (fig. 36). The C. bom's is 

 very rare in man, if it ever occurs. 



The adult form is common in the Tropics, though not 

 more so than in Europe. The usual intermediate hosts 

 are cattle, and in some countries, as in Abyssinia, where 

 5 



