PROTOZOA AND CGELENTEEATA. 



33 



the higher animals, we cannot wonder that in the 

 lower group? our knowledge is still less. 



In the Protozoa and Coelenterata no organs have yet 

 been met with to which this function can with any 

 confidence be ascribed. 



Fig. 31.— Epithelial 

 and (B) olfactory- 

 cells of man (from 

 Strieker, after 

 Schultze). 



Fig. 32.— Cells from tbe olfactory 

 region of a proteus (after Strieker). 

 a. Epithelial cells ; b, the apparent 

 processes; c, olfactory cells. A, 

 Cilia3. 



Meyer has described,* in Polyophthalmus (a small 

 marine worm), on each side of the head, two ciliated 

 organs (Fig. 33), which have been supposed to be organs 

 of smell. These had been already mentioned by 



* "Zur. Anat. und Hist, von Polyophthalmus," Arch, fllr Mic. 

 Anat, 1882. 



