296 



GENERAL BIOLOGY 



Taenia saginata. These eggs are ingested by pigs. This type of tape- 

 worm is rare in the human intestine in America, although it does occur. 

 The process of development is quite like that of Taenia saginata. The 

 cystic larvae of Taenia solium are called Cysticercus cellulosae. 



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

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



ir. 



Fig. 184. Types of Cestoda. 

 I. Heads of 1, Taenia Solium; 2, T. Saginata; 3, Dibothriocephalus 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 ; Vd., vas deferens ; C., cirrus ; Gp., genital pore ; Va., vagina ; 

 Rs. f 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.) 



