262 



DISEASES DUE TO HELMINTHS 



DIPYLIDIUM CANINUM. 



This parasite is found in the dog and cat but very rarely in man 

 and children. It is 15 to 40 m. long by 2 mm. broad. 



Dipylidiiim caninuiii : central portion of a proglottis. C.p., cirrus sac; 

 V.S., vitellaria ; Ex. v., excretojy vessels; T., testicles laying in the meshes 

 of the uterine reticulum which laterally forms pouches; O., ovary; f/., reticulu 

 of uterus; V., vagina and seminal receptacle (below ovary). Magnified. (Aft 

 Neumann and Railliet.) 



um 

 ;er 



Dipylidiiim caniunm : development of embryo, i, solid hexacanlh embryo ; 2, primitive 

 lacuna {a) in the embryo; 3, elongation of hinder part, rudiments of sucker and rostellum 

 appearing; 4, "body" and "tail" distinct, (/>) and (<r) excretory system; 5, fore-body 

 inv'ginates into hind-body, excretory bladder has a pore; 6, tail has dropped oft'; scolex 

 growing up into secondary cavity formed by fore-body ; the primitive cavity has been absorbed 

 at stage 4. (After fienham, Gras^i and Rovelli.) 



