12 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 82 



A small section of the nervous lobe, through the region a-b, 

 figure 17, is shown under fairly high magnification, in figure 20, 

 (pi. 3). To the left is seen the fairly thick capsule (c) and to the 

 right the ependyma (ep) lining the cavity of this region of the hypo- 

 physis and consisting of irregular columnar cells with large, round or 

 oval nuclei. The cell divisions of the ependyma may be seen only at 

 certain places and then with difficulty. The main body of this lobe 

 consists of the structures usually described. A dense mass of fine 

 fibers with widely scattered oval pyrif orm cells ; and an occasional 

 blood capillary (bv) are present and occasional groups of cells 

 which, in some cases, are seen to surround an alveolus (cy) containing 

 colloid. 



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