HYMENOLEPIS 



59 



other ectoparasites of the dog, too close association of 

 dogs and children should be avoided. 



In the other genera of Taeniidae found in man there 

 is a single set of genital organs in each proglottis. In 

 Hymenolepis and Davainea the genital pores in all the 

 segments are on the same side (fig. 24, C and D). These 

 genera are readily distinguished from each other by 

 differences in the genital organs. 



iff. 



FIG. 25. 0, Dipylidium caninum ; 3, enlarged half-grown segment; 

 /., testes ; v.d., vas deferens ; >., penis; va., vagina; ov., ovary; r.s., 

 receptaculum seminis ; v.g. t yolk-gland ; /., uterus. 



HYMENOLEPIS. 



Hymenolepis. Testes are large but few in number, 

 usually three or four in each segment. These are 

 arranged on the side opposite to the genital pore, and 



