PLATYHELMIXTHES CESTODA 



DOG-TAENIAE ] 



Single 



Head armed ; 

 genital pore 

 marginal 

 and 



Double and bilateral 

 Head unarmed ; two genital pores on ventral surface 



230,u-26<V long - ; genital 

 pore very distinct 



T. serrata Goeze. 

 136(1. 15/M long ; genital 

 pore not very salient 



T. serialis Ball. 

 180/x-220,iiloug ; length of 

 mature segments double 

 their width 



T. maryinata Batsch. 

 150yu- 170/* long ; length of 

 mature segments treble 

 their width 



T. coenurus Kiich. 

 T. echinococcits v. Sieb. 

 Dipylidium caninum L. 

 Mesoccstoides lineatus Goeze. 



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. fimbriata Dies. 

 /?. Head small ; no fimbriae ; pore rarely double . T. yiardii Riv. 



b. Uterus without saccular dilatations ; segments short, thick, and 



slightly imbricate . . ANOPLOCEPHALA E. Blanch. 



a Head verv larze-P P osterior lobes A - P licata Ze<L 



very large j Fouf pogterior lobeg A perfoliata Goeze 



ft. 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 (planissima 

 group) . . M. planissima S. and H. 



M. benedeni Mz. M. neumani Mz. 



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

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



c. Interproglottidal glands absent 



x ( M. dcnticulata Rud. 

 (dentuulata group) 



HORSE- 



TAENIAE. 



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^rsW 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. 



