BOTHRIOCEPHALOIDEA 213 



Fam. i. Tceniidce, with the characteristics of the order. 



(1) Subf. Mesocestoidines, with genital pores on the flat surface 



(Mesocestoides}. 



(2) Acolei'nce, without vagina, Acoleus. Dioecocestus sexually 



differentiated. 



(3) a AmabiliincB. Vagina on the surface ; cirrus situated at 



the border (Amabilia). 



(4) Tetrabothriinfs. Vitellarium in front of the ovary ; 



suckers with a muscular process, extending outward from 

 the anterior border ; genital pores at one side (Tetra- 

 bothrius}. 



(5) ,, Anoplocephalince . Scolex unarmed ; large ; without neck ; 



uterus in an oblique direction, tubular or reticular ; 

 eggs with " pyriform apparatus " (Anoplocephala, Bertia, 

 Stilesia, &c.). 



(6) DipylidiincB. Rostellum armed ; suckers unarmed ; genital 



pores marginal ; genitalia simple or duplicated. Uterus 

 merging into the ovarian follicle or becoming atrophied ; 

 eggs then free in the parenchyma (Dipylidium, Cotugnia, 

 Hymenolepis, Dilepis, &c.) 



(7) DavainemcB. Rostellum and suckers armed ; eggs mostly 



encapsuled (Davainea, &c.). 



(8) Tceniina. With rostellum and usually double crown 



of hooks ; uterus with median trunk and lateral branches 

 (T&nia). 



IV. Echinobothriida. Scolex consisting of the head and its neck ; the head 

 has a rostellum and two bothridia ; the neck has longitudinal row 

 of T-shaped hooks ; genitalia as in the Tetraphyllidea. but with the 

 genital pores on the flat surface (Echinobothrium). 



V. Rhynchobothriidcs . Scolex with head and neck ; the head having two 

 or four suckers and four retractile and armed rostella ; the neck 

 unarmed (Rhynchobothrius , &c.). 



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 definitive 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 cysticercus stage. 



A. Bothriocephaloidea. 



Gen. i. Dibothriocephalus, Lhe., 1899. 



Syn. : Bothriocephalus, p. p. Rud., 1819; Dibothrius, p. t>. Rud., 1819; 

 Dibothrium, p. p. Dies, 1850. 



Dibothriocephalidea with a more or less elongated, unarmed scolex, 

 and flat suckers, cutting rather deeply into the head : neck present or 



