ALLIES OF THE PELECYPODA : MOLLUSCA 183 



generative opening just back of the right eye-stalk, the anus, 

 and the nephridial opening near the lung-aperture. The 

 garden-slug, like the snails, has a rasping-tongue. 



If a person examines in daylight the under side of boxes or 

 bunches of straw that usually collect about a greenhouse, he 

 will find within the range 

 of the animal's distribution 

 many specimens with their 

 heads contracted to the 

 body, holding to the 



surface of the 

 thing which 

 conceals them. Frequently 

 after a night's forage on the 

 tender parts of greenhouse plants, 

 they go no farther away than the 

 bottom of the flower-pot. Reliable 

 observers have marked specimens 

 and have found that these creatures return night after night 

 to a particularly succulent plant, such as the Amaryllis in the 

 picture. It is thought by some that their " sense of direction" 

 lies in the ability to smell their food-plant. Some authors 

 believe that the organ of smell lies at or near the end of 



FIG. 94. Garden-Slug feeding 

 at Night, x i 



