This study is based on 2 d specimens, 14 in. long. The flattened pituitary gland lies close to the brain and is located caudad to the infundibulum. There is no sella turcica in the cranial floor. In a ventral view only the infundibular process and the flattened ovoid pars anterior are visible. The former is wide and thin-walled except in a median ventro-caudal region applied to the pars intermedia, where a considerable thickening occurs. The epithelial portion of the gland possesses a conspicuous hypophysial cavity which almost completely separates an antero-dorsal intermediate zone from a more elongated ventro-caudal pars distalis. The pars intermedia is composed of open or closed epithelial diverticula which are associated with the hypophysial cavity and are interdigitated with the compact fibrous portion of the infundibular process. The pars distalis is composed of cords of epithelial cells. The majority of the intermedia cells are basophilic but a number of cells reacting with orange G are present, especially in the region immediately in contact with the neural tissue. In the pars distalis chromophobes are rarely seen. After Heidenhain''s azan method 3 types of chromophilic cells may be distinguished deeply staining basophiles, acidophiles selectively stained with orange G and acidophiles reacting with azocarmine. There is no pars tuberalis or saccus vascu-losus.