350 



HISTOLOGY 



reticular structure becomes more evident until at the base there are 

 many vacuoles. The cells are poorly denned (Fig. 312). 



' - 



FIG. 312. Bit of epithelium from the storage region or bladder of the lobster, x 800. 



The nephridial tubule of the lizard, Iguana. In this case the termi- 

 nal wall of each tubule is invaginated by a vascular plexus to form a 

 Malpighian capsule. The capillary plexus is known as a glomus. 



FIG. 313. Section of a glomus of the Iguana's nephridial tubule, bl.ca., blood capillaries 

 entirely filled with dense, nucleated, red blood cells; ex.c., excretory cells; c.n., capillary 

 wall nucleus; conn.t., connective tissue; /., lumen of tubule (glomus). X 1500. 



The glomus has an afferent larger arteriole which breaks up into a 

 network of capillaries. This plexus of the arteriole forms a true rete 



