248 E. A. BAUMGARTNER 



this early constriction and realized that the later constriction 

 separating the pars intermedia from the anterior lobe is not the 

 same. In adult Sceloporus, at least, the pars intermedia is never 

 completely constricted from the anterior lobe. 



The hypophysis in adult turtles and lizards is ventral to the 

 third ventricle, although in turtles the infundibular outgrowth is 

 long. In alligators the infundibulum is long and the short hy- 

 pophysis lies ventral to it. The infundibulum in snakes is short 

 but the hypophysis extends relatively more caudalward. 



In the material studied, only adult Sceloporus show a residual 

 lumen and this is in the pars intermedia. An adult Hemidactylus 

 shows no cavity. Miiller ('70) described a cavity in the hy- 

 pophysis of Testudo. Haller ('96) termed the pars intermedia 

 'Sammelschlauch' and figured tubules of the posterior portion 

 of the main lobe emptying into its lumen. Sterzi ('04) believed 

 this to be incorrect as he found no residual lumen in lizards and 

 turtles. Gisi ('07) described a lumen filled with a coagulum in 

 Testudo graeca. Tilney ('11) mentioned a lumen in the hy- 

 pophysis in turtles, snakes and alligators. Herring ('13) figures 

 one between the pars intermedia and the pars glandularis of 

 turtles, while Stendell ('13 and '14) figures one in the 'Zwischen- 

 lappen' of Lacerta and one between the 'Zwischenlappen' and 

 'Hauptlappen' in Emys, although he states that its position and 

 occurrence varies in the Sauropsida. In turtles I have found 

 that, even with very careful preparation of specimens, occa- 

 sionally some of the pars intermedia is lost from the sections. 

 Because of the irregular walls, a lumen sometimes present be- 

 tween the pars intermedia and the anterior lobe, is not thought 

 to be a residual lumen but an artefact as Sterzi ('04) believed. 

 A lumen which might persist in the adult would be in the pars 

 intermedia because of the manner of its development. 



A well-developed stalk, formed by a constriction of the hy- 

 pophyseal anlage from the roof of the mouth is present in 6.4 

 mm. turtles, 9 mm. lizards and snakes, and 12 mm. alligators. 

 The stalk remains short in turtles and lizards, is slightly longer 

 in snakes and becomes very long in alligators. It has degen- 

 erated in 17 mm. turtles, except for a small cystic dilatation at 



