90 



PLATYHELMINTHES CESTODA 



Dog-Taeniae 



'Single 



Many proglottides ; 

 strobila several 

 centimetres long;./ 

 small hooks with 

 guard. 



Head armed ; 

 genital pore 

 marginal 

 and 



Bifid hooks, 

 which are 



Entire large 

 hooks, which 

 are 



a few mm. long . 



..3-4 segments 

 ^Double and bilateral 

 Head unarmed ; two genital pores on ventral surface 



230^-260^ long 2 ; genital 

 pore very distinct 



T. serrata Goeze. 

 136^157^ long ; genital 

 pore not very salient 



T. serialis Ball. 

 ^180/i-220Mlong ; length of 

 mature segments double 

 their width 



T. marginata Batsch. 

 150/W-170/A long ; length of 

 mature segments treble 

 their width 



T. coenurus Kiich. 



T. echinococcus v. Sieb. 



Dipylidium caninum L. 



Mesocestoides lineatus Goeze. 



b. 



HORSE- 



Taeniae 



Head very large- 



II. Scolex without hooks ; one or two transverse uteri present ; one or two 

 genital pores and yolk-glands, the latter never median ; genital ducts 

 pass on the dorsal side of the nerve ; eggs with pyriform apparatus. 



A. One transverse uterus present. 



a. Uterus with bullate egg-sacs ; pyriform apparatus without horns ; 

 genital ducts between dorsal and ventral vessels 



Thysanosoma Dies. 



a. Head large (1*5 mm.); square lobed testes in median field; 



posterior margin of segments fimbriated ; genital pore double 



T. Jimbriata Dies. 

 /5. Head small ; no fimbriae ; pore rarely double . T. giardii Kiv. 

 Uterus without saccular dilatations ; segments short, thick, and 

 slightly imbricate . . Anoplocephala E. Blanch. 



J No posterior lobes A. plicata Zed. 



Four posterior lobes A. perfoliata Goeze 

 /3. Head small, without*posterior lobes A. mamillana Mehl. 



B. Two uteri and two genital pores present ; horns of pyriform apparatus 



well developed ; genital ducts pass on the dorsal side of the longi- 

 tudinal vessels .... Moniezia R. Bl. 



a. Interproglottidal glands 3 arranged in linear series (pla7iissima 



group) . . M. pianissimo, S. and H. 



M. benedeni Mz. M. neumani Mz. 



b. Interproglottidal glands saccular (expansa group) M. expansa Rud. 



M. oblongiceps S. and H. M. trigonophora S. and H. 



c. Interproglottidal glands absent 



. 7 . . , . f M . denticulata Rud. 



(dentundata group) \ Malha v ^ 



C. Uterus single or double, without spore-like egg-sacs ; eggs with a 



single shell ; genital pores irregularly alternate ; strobila narrow ; 

 testes absent from median part of the field . Stilesia Raill. 



1 Taken from Neumann, Parasites of Domesticated Animals, 1892, p. 448. 



2 M~T*Vir millimetre. 



3 For a description of these glands, and for further diagnostic details and litera- 

 ture, see Stiles and Hassall, U. S. Department of Agriculture, Bureau of Animal 

 Industry, Bulletin 4, 1893. 



