I9I3-] T. SouTHWEiviv ; Indian Cestoda. 287 



Family diagnosis : — Taenioidea. Scolex with an armed rostel- 

 lum, or without rostellum. Hooks on rostellum not hammer- 

 shaped. Suckers usually unarmed. A single, or rarely a double 

 set of reproductive organs in each segment. Genital pores mar- 

 ginal and bilateral, unilateral, or regularly or irregularly alternate. 

 Egg with thin transparent shell. Adults in birds, mammals, 

 reptiles and amphibia. 



Type-genus Hymenolepis , Weinland, 1858. 



Sub-family (I) DIPYLIDIINAE, Stiles, 1896. 



=Rhynchotaenia, Diesing, 1850. 



= Malacolepidota, Weinland, 1858. 



^Cystoideae, Leuckart, 1863. 



=Cystoidotaeniae, Railliet, 1886. 



= JVlicrotaenia, Claus, 1891. 



= Diyplidinae, Railliet, 1896. 



::=^Dilepininae, Fuhrmann, 1907. 



= Dilepidinae, Railliet and Henry, 1909. 



Sub-family diagnosis: — Hymenolepididae. Rostellum armed 

 or rarely absent. Suckers unarmed. A single set, or rarely a 

 double set of reproductive organs in each segment. Uterus sac- 

 like, simple or lobulated, or not persistent, breaking down into 

 numerous egg capsules, each containing one or several eggs. 

 Para-uterine organs not developed. Adults in birds, mammals 

 and reptiles. 



Type-genus Dipylidium , Leuckart, 1863. 



Genus Dipylidium, Leuckart, 1863. 



Generic diagnosis: — Dipylidiinae. Rostellum armed with 

 several rings of rose- thorn hooklets, which usually have a discoidal 

 base. Suckers unarmed. Gravid segments generally longer than 

 broad. A double set of reproductive organs in each segment. 

 Genital pores double and opposite. Testicles very numerous and 

 scattered throughout entire medullary parenchyma. Vas deferens 

 coiled, seminal vesicle absent. Uterus at first reticular, later 

 breaking up into egg capsules, each containing one or more eggs. 

 Eggs with two shells. Adults in mammals and birds. 



Type-species Dipylidium caninum (Linn.), 1758. 



Dipylidium caninum (Linn., 1758). 

 Numerous specimens ; — 



ZE\' 



Z E V ^^K 



Z E V 2i7j). 



Dog (Cam's f(jintliat'is) ? ? 



Dog (Caiiis familiaris). Colombo, Ceylon. T. Southwell. 

 Cat (Fclis doniestica). Egypt. London School of Tropical 

 Medicine. 



Z E V i-'y-^. Dog {Canis faniiliayis). Lahore, Punjab. Punjab Civil 

 Vecerinary Department. 



