THE ALIMENTARY APPARATUS. 245 



Structure. The upper lobe is part of the central nervous 

 system. The lower and larger lobe has a fibrous capsule which 

 sends processes into the interior, forming minute septa; these 

 divide and reunite around spaces called alveoli. The alveoli con- 

 tain epithelial cells of various shapes, between which are small 

 irregular cells having flattened nuclei. 



THE GLANDULA coccYGEA, lying near the tip of the coccyx 

 and the INTERCAROTICA, at the angle of bifurcation of the com- 

 mon carotid, have been recently included among the ductless 

 glands. They were both discovered by Luschka. The frame- 

 work of their bodies is identical with that of other glands, except 

 that the septa contain non-striped muscular tissue. The alveoli 

 are filled with gland substance, consisting of connected masses 

 of epithelial cells, having in their centre a twisted capillary 

 blood-vessel. 



