00 THE ELEMENTS 



live specimens can only be bad by 

 trawling for them. 



The continental writers on Con- 

 chology, Lamarck, Latreille, &c. have 

 made a new genus from the Neritcp, 

 termed Natica, which embraces the 

 umbilicated kinds, such as the Glau- 

 cina and its corresponding species. 

 We, however, can see no particular 

 reason for making this a generic dis- 

 tinction. The Linnean NerittB is a 

 very good genus, and there is nothing 

 in the general character of any of the 

 species, which can perplex even a 

 young student. We think it tends ra- 

 ther to retard than to advance the pro- 

 gress of the science, to construct new 

 fienera, where there are not strono' 

 motives fordoing so. 



In Turton's Linne 76 species of 

 Nerites are described ; and eight 

 species have been found indigenous to 

 Britain. 



Genus 31st.- -HALIOTIS. Ani- 



