The Worm Shells and Pod Shells 



and spiral outside. Mollusks live on coral rock or sponges on 

 tropical shores. 



The Pod Shell (S. anguina, Linn.) is like the spirally twisted 

 pods of certain leguminous plants. The long open groove in 

 the shell distinguishes it from the worm shell. This species 

 begins as a close spiral, but soon becomes irregular. It is a heavy 

 yellowish shell, cylindrical, 3 to 6 inches long, and one-half inch 

 in diameter at its mouth. It is found imbedded in sponges. 



Habitat. — Mediterranean Sea. 



S. modesta, Dall, unmistakably a pod shell, occurs in deep 

 water from Cedar Keys, west coast of Florida, through the West 

 Indies. 



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