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The Nervous System in the Cestode Moniezia expansa. 



Wm. L. Tower. 



With Plates 2126. 



Contents. 



Introduction. 



I. Material and Methods. 



A. Material. 



B. Methods. 



1. Media for Collecting and 



2. Keeping Cestodes alive in the Laboratory. 



3. Methods of Fixing and Staining the Nervous tissues. 

 II. Description of the Nervous System. 



1. In the Scolex. 



2. In the Neck Region. 



3. In the Mature Proglottides. 

 Papers cited. 



Explanation of Plates. 



Introduction. 



The work of which this is an account was done during the winter 

 of 189596. A preliminary paper was published in the Zoologischer 

 Anzeiger, July 20, 1896. It was my intention at that time to follow 

 the preliminary paper with a final one as soon as it could be pre- 

 pared, but ill- heath and other circumstances over which I have had 

 no control have delayed its preparation much longer than I expected. 



When this work was begun the knowledge of the nervous system 

 in Cestodes was in a very unsatisfactory condition. The anatomy, 

 and, to some extent, the histology of these forms, exclusive of the 

 nervous system, were fairly well known. Considering the valuable 



Zool. Jahrb. X11L Abth. f. Morph. 24 



