44 DISEASES OV POULTRY. 



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

 cally called the buccal capsule, the oesophagus and the in - 

 testinal canal can be easily made out. In the female, /', 

 can be faintlj^ seen the uterus and its horns filled with 

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

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

 (I 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, l)d the uterine 

 horns, rr oviducts or Fallo])ian tubes, and dd ovaries. 

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

 H, a being spicules, Ij spermatic canal, r vesicula semi- 

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

 eggs, in different stages of development. The seg- 

 mented vitellus appears at a; at /' the vitellus is granu- 

 lar and becoming constricted at its middle, the embrj'o 

 developing lateralljs r shows the ovum with embrj'o 

 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 clearl}' shown in 

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

 leaves the ep^g ; l> is an embryo somewhat older and 

 undergoing the first molt; c is the n3'mph, the rudi- 

 ments of the genital organ showing at x. 



Young birds become infected with this parasite either 

 by eating the adult worms, containing eggs, which are 

 coughed u]) by affected birds, or by taking the em- 

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

 the sj-ngamus should pass any period of its existence 

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



