CONTENTS. 
Page. 
List of illustrations 5 
Summary 7 
Introduction 10 
Genus Hymenolepis 11 
Generic diagnosis 11 
Key for the determination of the species of Hymenolepis parasitic in 
man 12 
The dwarf tapeworm, Hymenolepis nona 12 
Specific diagnosis 12 
Habitat 13 
Development 13 
Geographic distribution 13 
The flavopunctate tapeworm, Hymenolepis diminuta 13 
Specific diagnosis 13 
Habitat 13 
Development 14 
Geographic distribution 14 
The lanceolate tapeworm, Hymenolepis lanceolata 14 
Specific diagnosis 14 
Habitat 14 
Development 14 
Geographic distribution 14 
The dwarf tapeworm, Hymenolepis nana 14 
Historical review 14 
Anatomical description 18 
External anatomy 18 
Internal anatomy 22 
Rostellum 23 
Nervous system 24 
Muscular system 24 
Excretory system 26 
Reproductive system 26 
Male organs 27 
Female organs 27 
Eggs 29 
Development and life history 33 
Abstracts of cases in man 42 
Africa 42 
Europe 42 
Asia 57 
America 57 
Analysis of cases and discussion of symptoms 61 
Age and sex of individuals affected 61 
General environment and social position of infected individuals 61 
Prevalence of infection 62 
Geographic distribution 62 
3 
