OF CONCHOLOGY. 73 



found a few inches under the sand. 

 They may be frequently taken alive 

 in little pools, between high and low 

 water-mark, in which they are often 

 seen sporting, with a very rapid mo- 

 tion in the sun-beams. 



The animal inhabiting the Bulla is 

 considerably too large for its shell, 

 and cannot contract itself wholly with- 

 in it, as most other animals can do, 

 which inhabit shells. 



The French Conchologists have di- 

 vided this genus into several new 

 ones ; the most prominent of these is 

 the Ovum ; at the head of which 

 stands Linne's Bulla Ovum. 



In Turton's Linne fifty-two species 

 of Bullae are described ; and nineteen 

 species have been found to be indige- 

 nous to the British seas, lakes, rivers, 

 &c. 



Genus 23d— VOLUTA. Animal 

 a Limax ; shell single-celled and spi- 

 ral ; aperture without a beak and 

 L 



