Flatworms and Threadworms 



.297 



saginata. The cystic larvae of Taenia solium are called Cysticercus 

 cellulosae. 



Bothriocephalus Latus is tound in many types of fish, such as sal- 

 mon, trout, perch, etc., and, if this is ingested by man, it passes through 



ii. 



Fig. 184. Types of Cestoda. 



I. Heads of 1, Taenia Solium; 2, T, Saginata; 3, Dibothrioccpltalus latus; 

 4, Dipylidium caninum, this latter showing rostrum both evaginated and invagi- 

 nated; 5, immature and 6, mature cysticercoid. (From various authors.) 

 II. Diagram of the anatomy of Tapeworms. 1, Taenia saginata; 2, Dibothrioce- 

 phalus latus. T, testes; Vol., vas deferens; C, cirrus; Gp., genital pore; Va., vagina; 

 Rs., receptaculum seminis; Vtg., vitelline glands; Vtd., vitelline duct; Sg., shell 

 gland; Ov., ovaries; Ovd., Oviduct; Ut., uterus; Ot., ootype; Exd., excretory duct; 

 Mt., metraterm. (After Rivas.) 



the various stages already mentioned and produces considerable anaemia. 

 The genital openings are on the face of each segment in Bothriocephalus 

 latus instead of at the edges as in Taenia. 



Taenia echinococcus differs from the three forms just mentioned in 

 that man is the intermediate host and the dog the true host. 



