256 E. A. BAUMGARTNER 



Turtles 



The pars intermedia, surrounding the infundibulum (pars in- 

 fundibularisof Tilney '13) is composed of laminae of cells. In 

 front there is a single layer which caudally becomes irregular 

 and folded, extending between the various infundibular branches. 

 More caudally there are several laminae, separated from each 

 other by connective tissue and capillaries. They are also sepa- 

 rated from the infundibulum and anterior lobe. Figure 56 is 

 a cross section of this lobe and the infundibular wall, showing 

 the arrangement and foldings of the laminae. The cells are 

 columnar. The non-granular cytoplasm stains lightly with eosin. 

 Cell membranes are not always clearly defined, although the 

 appearance is not that of a syncytium. The oval or flattened 

 nuclei are usually placed lengthwise near the center of the cells, 

 so that there is a cytoplasmic zone along either edge of the 

 lamina. The zone in contact with the infundibulum is some- 

 what wider than those found elsewhere. The nuclei have a very 

 fine chromatin network and usually one, sometimes two or more, 

 prominent nucleoli. 



As previously stated, the middle part of the anterior lobe is 

 surrounded by a thin cortical layer derived from the lateral buds. 

 The anterior lobe, with the exception of this zone, is composed 

 of tubules and flattened cords of cells, irregularly arranged as 

 described by Sterzi ('04). Haller ('96) figured these cords run- 

 ning lengthwise. The lumina of the tubules occasionally con- 

 tain a colloid-like substance. The cells are columnar or poly- 

 hedral, with centrally placed nuclei (fig. 52), and take the stain 

 more readily than those of the pars intermedia. Some of the 

 cells stain more deeply than others in the same cords or tubules. 

 This is true of sections stained with eosin-methylene blue and 

 with Giemsa. In sections stained with Mallory's phosphotung- 

 stic acid haematoxylin, some of the cells take a purplish color 

 while others are almost colorless. With iron haematoxylin some 

 stain even darker than the nuclei. Again, sometimes all of the 

 cells in one section of a tubule or cord stain deeply, the peripheral 

 cytoplasm as well as that next the lumen retaining the dye. 



