POULTRY dise;ase;s and the;ir treatment. ']J 



f fertilized and mature the segment 



^A containing them drops off and passes 



V'^, to the exterior with the feces of the 



-\ V — , ( _,4 host. Each segment of this kind 



^ Y~"\ l-w contains thousands of eggs. 



~^ \ 4 V-—* If these eggs are to develop far- 



1 r— ;! ) — ; ther they must be swallowed by some 



\ p"/ I n intermediate host (as a worm, snail 



] f J X"^; or insect). The tgg then hatches 



I \ I ( ^1 into a 6-hooked embryo which bores 



' I -'■. . / "j - its way from the intestine into the 



r—) / 1 body cavity of the intermediate host. 



r "^Z [_ ' It here develops into a larval form 



\ / / j known as a cysticcrcoid. When the 



\_i [ i intermediate host (worm, snail, etc.) 



hn I _^ is eaten by a chicken this larva con- 



PJ w ,! tinues its development and forms 



r— 4 r— 1 an adult tape worm. Thus there 



V / j-^-] are two stages in the life cycle of a 



f- -; r — ^i tape worm : that in the adult host 



P_7 r~1 ^^'^^ that in the intermediate host. 



)__i L"! Each species of tape worm, of which 



h-j [_:21 there are a great many, has its par- 



L''1 tirJ ticular host, both intermediate and 



X(/:;.-^ - According to Stiles (Bur. An. 



Fig. 6. Drepanidotacnia in 1"^]. Bul. 12) there were up to 1896, 



fundibuUfonnis. a tape 33 species of tape worms i-ecorded 



worm of the fowl. (Af- for poultry. Of these 1 1 are re- 



ter Stiles). corded as occurring in chickens. 



The complete life history is known 

 for only a few of these. Regarding the tape worms of chick- 

 ens, Stiles (loc. cif.) says, p. 13: "(They) are knozvv to become 

 infected with one tape worm through eating slugs (Limax). 

 They are supposed to become infected with a second through 

 eating snails (Helix) ; by a third through eating flies and by a 

 fourth through eating earth worms." 



There seems but little need to give a description of the differ- 

 ent species of tape worms found in chickens. The characters 

 by which they are distinguished from each other are too minute 

 and involved to be of use to the poultryman or farmer. If any- 

 one is having trouble with tape worms in poultry the best thing 



