112 



STUDIES IN PHYSIOLOGY 



---Mouffr 



fftffry/?* 



ope/7//fgs 

 Ganglia co/ist/tt/t/ng- ~ ~ . 



dosser? surface. x 



FIG. 38. The Earthworm. 



A = side view of an earthworm. 



B = dorsal view of a dissected earthworm. 



(7 = longitudinal section of an earthworm. 



The Alimentary Canal of the Earthworm. At the anterior 

 end of the worm is a small slitlike mouth opening, which 

 communicates with the pharynx. By means of this more or 

 less barrel-shaped organ the animal sucks in its food. Pos- 



