CHAPTER XXV: THE SLIPPER SHELLS. 

 CUP-AND-SAUCER LIMPETS 



Family Calyptr/€Id.^ 



Shell limpet-shaped with more or less spiral apex, porcel- 

 lanous, interior polished, usually with a septum or internal plate 

 of variable shape; operculum wanting; pot flattened; body not 

 twisted; gill deeply and finely feathered; head with long snout; 

 eyes near external bases of tentacles. 



The limpet-like mollusks of this family are found adhering to 

 stones and shells. It is likely that most of them stay in one spot 

 all their lives. They adapt the shape of their shell to the irre- 

 gularities of the chosen location, taking on the same sculpture 

 often, and the same colours. They feed on seaweeds and animal- 

 culae that come their way, occasionally devouring a fellow mollusk. 

 Some genera lay their eggs under the foot as in a brood pouch. 

 The body is supported by muscles attached to the shelly process 

 inside the shield. 



THE SLIPPER SHELLS. BOAT SHELLS. SLIPPER 



LIMPETS 



Genus CREPIDULA, Lam. 



Shells oval, with a horizontal plate closing about one-half 

 of the aperture. Apex lateral, spiral; head flat; foot short; 

 very common shells on all American beaches. 



The Arched Slipper Shell (C. fornicaia, Linn.) is loved 

 by children, it is useful in so many ways when seaside play- 

 houses are to be furnished. The boat shape appeals to the imag- 

 ination, with its broad bottom, its rounded stern and comfortable 

 seat. Balanced on the table and on cupboard shelves these 

 shells are the little housekeeper's joy in setting forth dolls' tea 



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