with siicli I'oniis as ■ruciiui solium iif man. True, other 

 aulliors liad rocoguizoil tlio j^reat dilTi'iciuo in sonic 

 characters, l>u( tlie group is such a tiitlic nil our Ui hau 

 die that lielmiuthohigisls, either Irom lacl; of time, 

 material, or courage, have carefully aNoidcd any at 

 lenii)t at a natural classilication. 



Mlauchard brousiht some order into the iiroup iu ISlU 

 by proposinsi; the new genera Davainea and Kchino 

 eolyle for certain form.s, while Kailiiet followed up the 

 work by pioposing the genera Hreiianidotaenia I>i 

 erauolaenia. and Hothriotaenia for certain other forms. 

 These live new genera, together with Mesocestoides, 

 Ophryocolyle, t'otugnia, and Amabilia enable us to 

 make a provisional classification by genera. It should, 

 however, be remembered that this classification is nec- 

 essarily i>rovisional in nature, as the internal anatomy 

 of these w-orms is as yet very poorly understood, and 

 .■I thorough study of that subject will probably r(>sull 

 in great changes. 



Regarding the species it may be again remaiked 

 (hat a considerable number of ditTerent fftims have 

 been described, but that a number of these species will 

 unquestionably fall, while new species will have to 

 be described for foinis which aie not yet recogiii/.alile 

 as disliiief. 



.\KALYTICAI, KEY TO KAMIt.lES ANH (lENERA 



Head with Iwo elonsated 

 grooves or slit-ni<o suck- 

 ers; rostellum wanting; 

 uterus witli special pore; 

 genital pores generally 

 dorsal or ventral BOTHRIOCRPH.\t>TD.\K. p. r.7!) 



Head with four cup-shaped 

 suckers: rostellum pre- 

 sent but not always evi- 

 dent; uterus without any 

 special pore; genital pores 



generally n-.arginal TAKNIIP.M-";. p .iS4 



Head Is C'dwnvs'"! absent 



