172 



UNSEGMENTED " WORMS." 



frequent of the tapeworms infesting man. In its adult state 

 it is often many feet in length, and is attached by its " head " 

 to the wall of the intestine. The head bears four suckers 

 and a crown of hooks, and buds off a long chain of joints, 

 which develop complex reproductive organs as they get 



v.d 



FIG. 55. Diagram of reproductive organs in Cestode joint. 

 (Constructed from LEUCKART.) 



ov,, Ovary, with short oviduct ; /., uterus ; t., diffuse testes ; 

 sh.g., shell gland ; y.g., yolk gland ; v.d., vas deferens ; 71. vagina ; 

 r.s., receptaculum seminis ; I.e., longitudinal excretory ducts ; f.e., 

 transverse bridges connecting these. 



The dotted lines above and below represent the anterior and 

 posterior borders of the proglottis. 



shunted further and further from the head. The last of the 

 joints or proglottides, is liberated (singly or along with 



