296 GLOSSARY. 



Papilla (plural papittce) : a small rounded protuberance. 



Parasite : a hanger on ; as one animal or plant living at the expense 

 of another. 



Parietal: pertaining to the wall or side. 



Pellet: a little ball or mass. 



Pellucid : translucent or transparent. 



Pendent: hanging. 



Perianth : the leaves of a flower that cannot be distinguished into a 

 calyx and corolla. 



Pigment : coloring matter. 



Podal : pertaining to, or used as, feet. 



Polyp : a radiate animal, without locomotive organs, with retractile 

 tentacles around the mouth, and a hollow body in which are sus- 

 pended the digestive and other organs. 



Posterior : the rear end. 



Prehensile : adapted for grasping or seizing. 



Process : a part prolonged or projecting beyond other parts connect- 

 ed with it. 



Protoplasm : the semi-fluid, jelly-like contents of cells. 



Protrusible : capable of being thrust forward. 



Pulsating : throbbing, beating. 



Recurved : directed backward. 



Refracting : bending from a direct course. 



Reticulated : with the form of a net. 



Retort : a chemical glass vessel. 



Retractile : capable of being drawn back or into the body. 



Rudimental : imperfectly developed or formed ; immature. 



Segment : one of the rings or component parts of a worm or other 



body. 



Semi: in compound words, meaning half. 

 Serrate : toothed like a saw. 

 Shaft : the stem or straight part between the ends. 

 Silicious : resembling or formed of silica. 

 Spherical : round like a ball. 

 Spinous : bearing spines. 

 Spiral : winding like a screw. 

 Spore: the minute seed of flowerless plants. 



