350 



HISTOLOGY 



reticular structure becomes more evident until at the base there are 

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



FlG. 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. 



;bl. co. 



. t. 



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 rele 



