60 ECHINOCOCCUS GRANULOSUS 



Common in man; of cosmopoli- Common in rats and incidental 

 tan distribution. May pro- in man 



duce intestinal disturbances 

 especially in children 



2. Genus Taenia. Suckers unarmed; uterus with median 

 longitudinal stem and lateral branches; female genitalia in 

 posterior end of proglottid; genital pores irregularly alter- 

 nating; testes numerous, in front of female genitalia; ovary 

 with two wings; vitellaria behind ovary. Eggs with thin 

 outer membrane and striated thick brown inner shell. 

 Adults in carnivorous mammals and larval stages in herbivor- 

 ous mammals. Cosmopolitan in distribution. 



Taenia solium (Plate VII, Taenia saginata (Plate VII, 



Fig. 3 c, d) Fig. 4 and 3 a, b) 



Scolex globular about 1 mm. in Scolex quadrangular 1.5 to 2 



length mm. 



Rosellum with two crowns of Rostellum and hooks absent 



hooks 



Length 2-8 meters Length 4-12 meters 



Number of proglottids 700-1000 Number of proglottids about 2000 



Genital pores irregularly alter- Genital pores more regularly 



nating alternating 



Branches of uterus in gravid Branches of uterus in gravid 



proglottis 5 to 10 in number proglottis 15-30, dichotomous 



and dendritic 



Proglottids expelled in groups Proglottids expelled singly and 



passively with feces may force anal sphincter 



Larval form Cysticercus cellu- Larval form Cysticercus bovis 



losae of the pig, sometimes in cattle, never found in man 



in man 



8. Echinococcus granulosus (Taenia echinococcus). Adult 

 inhabits small intestine of dog, jackall and wolf; measures 

 2.5 to 6 mm. in length; scolex 0.3 mm. in breadth with a 

 double row of twenty-eight to fifty booklets on the rostellum ; 

 number of segments 3 to 4, the posterior segment being about 



