zoo ECONOMIC ZOOLOGY AND ENTOMOLOGY 



cerebral ganglion 



retractor and protractor 

 muscles of the pharynx^ 



(esophageal pouches-- 

 seminal receptacles~ 



seminal 



pharynx 

 {esophagus 



nephridium T^. 



gizzard f-- .^ 



FIG. 37. Dissection of the earthworm, Lumbricus sp. 



