AVIAN CESTODES. 593 



which are generally speaking very abundant in this species, so 

 much so that I should be inclined to add the abundance of these 

 bodies to any definition of the species. This is another reason 

 for refusing to accept the identity of the worms from Struthio 

 onasaicus with those from Struthio molyhdophanes. 



The general shape of the body of this worm is as figured by 

 Parona. The anterior region of the body is slender ; it is much 

 wider posteriorly, but not by any means so wide as in the species 



Text-figure 2. 



T. Li Lz. , ^ 



,^^o ^ 6^/gr. 



hi, 



m^^^. 





Wwt 



■|;|5*V>^*-^ **® 



«»4i , 



i 1 <9^^%/L.Zi «■»* 



#® 



^:^': 



* * 6 



Part of a transverse section through a proglottid in anterior region of body. 



G. Cuticle. Ij\ & Ij2. Laj^ers of longitudinal muscles. T. Transverse 

 muscles. 



described by Parona. I found 5 mm. to be the greatest diameter 

 of the posterior proglottids. They are overlapping, and as a 

 rule so contracted as to be much wider than long. In a few cases 

 the proglottids were, however, more expanded, but were never 

 actually longer than broad. The worms reach a length of pei'haps 

 nine or ten inches. 



The coitical layer is deep, the diameter being greater than 



