ZOOLOGT. 263 



These shells inhabit the shores of the sea, rivers, and lakes, 

 some are found adhering to sea-weed, pieces of wrecks, or 

 other extraneous substances, others are only met with in 

 deep waters, and may be taken in nets. Most of the kinds 

 are exceedingly beautiful, and the animals are often eaten by 

 the natives of the sea shores. The species are numerous, 

 though but few are common to this country. , 



31. Haliotis. Ear-Shei,l. Inhabitant a Limax. 



Shell ear-shaped, open ; spire lateral, and nearly obscure ; 

 disk longitudinally perforated with pores. Plate 5, 

 fig. 31. The genus is divided into Perforated and 

 Imperforated. 



The species are ail marine, and are generally found close- 

 ly adhering to rocks or stones, within the influx of the tide, 

 and it requires some adroitness to detach them without injury 

 to their shells ; the animal is accounted delicate food. The 

 species are not numerous, and we have only one indigenous 

 to Great Britain. 



Division II, 



SHELLS, WITHOUT A REGULAR SPIRE. 



32, Patella, Limpet, Inhabitant a Slug, 



Shell conical, wittiout any defined spire. Plate 5, fig. 32. 

 The genus consists of five families : * Labiated, or 

 furnished with an internal lip : ** Margin angular, or 



s 4 



