460 CHARLES 11. STOCKARD AND E. M. VTCARI 



dachshund, and the ventricular sac passes through the in- 

 fundibular stalk and far into the pars nervosa. The pars 

 intermedia intimately infiltrates the nervosa around the 

 periphery, and colloidal follicles of varying sizes are present 

 in all its regions. Colloidal follicles and drops also occur 

 in the pars distalis, as is seen in its posterior end in figure 

 6. The infundibular stalk is long and surrounded by the 

 pars tuberalis, which is profusely and completely penetrated 

 by diverticula from the residual lumen. These numerous 

 diverticula are clearly seen in three of the F x sections in 

 plate 88, and in figure 5 such diverticula from the original 

 hypophyseal lumen appear to take part in the extensive 

 cystic formations in the pars tuberalis area, leading back in 

 many cases into the pars distalis. In most of the specimens, 

 the glandular cells of the pars distalis exhibit a distinct 

 tendency toward cord-like arrangements, such as are found in 

 the Boston terrier gland, and there is more connective tissue 

 than usual. The relative proportion of acidophiles to baso- 

 phils has a wide range, but averages about twenty to one, 

 a relatively low basophile proportion. 



The striking feature in these F x glands is the prevalence 

 of large multiple cysts characterized by a lining of columnar 

 epithelial cells of which many are ciliated and others filled 

 with mucus to varying degrees, often attaining the typical 

 goblet-cell form. The nature of these cysts as a whole is 

 exactly similar to those in Boston terrier glands where the 

 epithelium is high or columnar and frequently ciliated, ex- 

 hibiting many features of the early stomodeal epithelium. 

 Cysts are much rarer in the dachshund pituitary and differ 

 from the above in that they are smaller and have linings of 

 low cuboidal non-ciliated epithelium. Such characteristics in- 

 dicate that in the dachshund much less extensive, less per- 

 sistent and less frequent arrests are involved in the freeing 

 of Rathke's pouch from its association with the stomodeal 

 epithelium than in the Boston terrier and the F x hybrids. 



The cystic condition in the F, pituitaries, as well as the 

 cord-like arrangement of glandular cells in the pars distalis, 



