NEW AVIAN TAPEWORM. 



197 



accurate account or figures of tlie rostellar hooks. I can only 

 say that they are curved :uul Iiook-like, not straight, and very 

 numerous, certainly at least 150 in monber, and prohnldy more, 

 and that they are disposed in an alternating fashion, forming a 

 double crown. 



Text-fig. 20. 



Loiifyitiulinal section through scolex of OtiditcBnia eufodotidis. 



R. Rudimentary rostellum (the hooks are too small to appear). S. One or 

 the suckers. N. Lateral nerve-cord of one side. 



The longitudinal section from which the annexed text-figure of 

 the rostellum was drawn also shows very well the existence of 

 a neck in this tapeworm. It varies much in length, though it 

 is never longer than the length of three or four proglottids 

 immediately following upon it. On the other hand, it is some- 

 times very short, not more than the length of the first proglottid. 

 If this had not been observed in the living worm, where the neck 

 is much more distinct, as such, from tlie proglottids than in alcohol- 



