SUPPORTING AND CONNECTING TISSUES 55 



gland duct may be reduced in size until it is an opening between two 

 contiguous cells, as is to be seen in the mammalian liver. Or it may 

 be a passage through the embracing arms of a single cell. This is well 

 shown in the earthworm's nephridium (see Chapter XIX). 



Lastly, the terminal proximal branches of a duct enter often into the 

 body of the cytoplasm to form the intracellular gland ducts. 



