218 E. A. BAUMGARTNER 



In 1904 Sterzi's paper on the structure of the hypophysis 

 appeared. He carefully described the histology of the hypoph- 

 ysis in several Saurians and Chelonians and in one alligator. 

 In all, Sterzi found a small median as well as an inferior portion, 

 and a nervous, superior portion. The median lobe in Saurians 

 forms a stratum around the nervous lobe. No lumen could be 

 found in this lobe. The cells are arranged in masses. Some 

 of the cells are large and elliptical with spherical nuclei, poor in 

 chromatin but containing a large nucleolus. The cytoplasm 

 stains lightly. Other cells are small, with dark-staining nuclei, 

 and appear compressed between the large cells. The inferior 

 lobe is large and has small cells which contain numerous granules 

 with an affinity for stain. Here the cells are arranged in columns 

 between which are numerous blood vessels. In Emys lutaria 

 and Testudo graeca the inferior part has two small lateral lobes 

 at the caudal end and a small anterior prolongation lying against 

 the floor of the brain. The cells are arranged in cell cords 

 smaller than those in the lizards. The cytoplasm is full of 

 chromophilic granules, although numerous cells are found which 

 contain few or no granules. The nuclei are spherical and con- 

 tain nucleoli. The capillaries are surrounded by connective tis- 

 sue. The median portion is a thin stratum interposed between 

 the inferior lobe of the brain and the inferior lobes of the hy- 

 pophysis and separated from the former by a distinct connective 

 tissue stratum. The cells are of two kinds, are arranged in 

 lamina, and are chromophobic. In one specimen of alligator, 

 Sterzi found the median lobe small and the anterior diverticulum 

 lacking. Sterzi has described median and inferior lobes in rep- 

 tiles as in other vertebrates, the first being chromophobic and 

 small, the latter chromophilic and large. The cavity described 

 by Haller ('96) was not observed by Sterzi, nor was any evi- 

 dence found of an opening to the subdural space. 



Gentes ('07) stated that the juxta-neural and distal parts of 

 the hypophysis of reptiles are partially separated by a fibrous 

 lamina, and in Chelonia by a cleft, at the periphery of which 

 the two parts fuse. 



