44 DISEASES OF POULTRY. 



idea of their structure. The cup -shaped mouth , techni - 

 cally called the buccal capsule, the oesophagus and the|n - 

 testinal canal can be easily made out. In the female^ b, 

 can be faintly seen the uterus and its horns filled with 

 ova, or eggs, and coiled around the uterus and intes- 

 tines is the ctearly -defined ovarian tube. In the male 

 a the elongated testicle is shown coiled about the diges - 

 tive tube. A, shows the mouth of the female 'as 

 seen from its face; and B, shows the same part as 

 seen from the side. 



The reproductive organs of the female are seen in 

 Fig. 7 G, in which a represents the uterus, bb the uterine 

 horns, re oviducts or Fallopian tubes, and fif(/ ovaries. 

 The reproductive organs of the male are shown in Fig.' 7 

 H, a being spicules, b spermatic canal, c vesicula semi- 

 nalis, and ^testes. Fig. 6 I, is a drawing of the ova, or 

 eggs, in differelit sljages of development. The seg- 

 mented vitellus appears at a ; sXb the vitellus is granu - 

 lar and becoming constricted at its middle, the embryo 

 developing laterally, c shows the ovum with embryo 

 fully developed' and folded like the figure 8, «/ the^ovum 

 with the valves at the extremities detached and the 

 embryo emerging. 



The characters of the embryos are clearly shown in 

 Fig. 6 K, where a represents the embryo directly after it 

 leaves the egg ; ^ is an embryo somewhat older and 

 undergoing the first molt; c is the nymph, the rudi- 

 ments of the genital organ showing 2X x. 



Young birds become infected with this parasite either 

 by eating the adult worms, containing eggs, which are 

 coughed up by affected birds, or by taking the em- 

 bryos with the food or drink. It is not necessary that 

 the syngamus should pass any period of its existence 

 outside of the bird's body, although it is capable of 



