NEW AVIAN TAPEWORM. 



199 



mature proglottids are represented in several aspects in text- 

 figure 19 (p. 194). These proglottids, as there depicted, have 

 a*very peculiar form, and have quite lost the flattened appearance 

 of the anterior region of the strobila. They are, indeed, almost 

 spherical in general outline. The projecting frill remains, but its 

 edges are closely adpressed. A single proglottid presents much 

 the appearance of a full sack with the lips of the mouth closely 

 drawn together. 



Text-fig. 22. 



f 



^^ 



Left-hand figure a ventral view of eight nearly mature proglottids of 



Otiditania eupodotidis. 

 Right-hand figure a lateral view of the same showing genital pores. 



The last external character to be noticed is the position and 

 character of the genital pores. These are irregularly alternate. 

 The pores are simple orifices upon the lateral surfaces of the 

 proglottids, and are not in any way prolonged into a spout-like 

 outgrowth. They are, however, situated on an area which covers 

 the whole of the lateral face of the segment, and is slightly raised ; 

 it is also whiter in colour than the rest of the (rather yellowish) 

 body. Finally, the segment is longer from before backwards on 

 the side which bears the genital pore ; this inequality of the two 

 sides of a segment enables the position of a genital pore to be 

 fixed without actually inspecting the orifice (text-fig. 22). 



In transverse sections of the body before the reproductive 

 organs are to be seen, except in rudiment, the cortical parenchyma 

 will be observed to be fully as thick as the medullary parenchyma. 

 Indeed, anteriorly in the segment before the overlapping frill has 

 detached itself the cortical parenchyma is actually the thicker. 

 The longitudinal muscle-fibres seen in this layer are disposed 



