CLASSIFICATION OF THE CESTODA 309 



Family. Dipylidiidae, Liihe, 1910. 



Rostellum if present armed. Suckers unarmed. Uterus breaks up into egg 

 capsules. Paruterine organs absent. 



Family. Hymenolepididae, Railliet and Henry, 1909. 



Segment always broader than long. Genitalia single. Longitudinal muscles in 

 two layers. Genital pores unilateral. Testes one to four. Uterus persistent, sac- 

 like. Eggs with three shells. 



Family. Davaineidae, Fuhrmann, 1907. 



Rostellum cushion-shaped. Armed with numerous (sixty to several thousand) 

 hammer-shaped hooks in two (rarely one) rows. 



Sub-family. Davaineinae, Braun, 1900. 

 Suckers armed. Uterus breaks up into egg capsules. Paruterine organs absent. 



Family. Taeniidae, Ludwig, 1886. 



Suckers unarmed. Uterus with median longitudinal stem and lateral branches. 

 Female genitalia at the hind end of the proglottis. Genital pore irregularly alter- 

 nating. Testes numerous in front of female genitalia. Ovary with two lobes (wings). 

 Vitellarium behind the ovary. Embryophore radially striated. 



THE CESTODES OF MAN. 



Most of the species to be mentioned live in man in their adult 

 stage and occupy the small intestine ; man is the definite host of these 

 parasites, but is not the specific host for all the species ; some of these 

 species, as well as others (of mammals), may occur in man also in the 

 larval stage. 



Family. Dibothriocephalidae. 



Sub-family. Dibothriocephalinae. 



Genus. Dibothriocephalus, Liihe, 1899. 



Syn. : Diphyllobothrium, Cobbold, 1858; Bothriocephalus,y.^.K.Vi&., 1819; 

 Dibothrius, p. p. Rud., 1819 ; Dibothrium, p. p. Dies., 1850. 



Scolex egg-shaped ; dorsal and ventral bothria elongated, moderately strong, 

 cutting rather deeply into the head ; genitalia single in each proglottis ; papillae in 

 the vicinity of the genital atrium ; the testes and vitellaria are in the lateral fields, the 



