OF CONCHOLOGY. 83 



that the Linnean Turbo, in its present 

 form, is rather too copious and diffuse, 

 yet we cannot approve of establishing 

 new genera from shells, which differ 

 in so trifling a degree ; as genera, 

 established on such flimsy grounds, 

 would be endless. 



In Turton's Linne 151 species of 

 Turbines are described ; and no less 

 than C9 species have been ascertained 

 as indigenous to Britain. 



Genus 20th.— HELIX. Animal a 

 Limax; shell univalve, spiral, subdia- 

 phanous, brittle ; aperture contracted, 

 semilunar or roundish. Linn. Syst. 

 328. Plate 7th, fig. 29th. 



Linne divides the Helices into six 

 families: *Ancipites ; &c. angulated on 

 both sides ; **Carinata?, &c. whorls 

 with a carinate acute margin ; *** 

 Rotundatae, &c. whorls rounded and 

 umbilicated ; ****rounded and imper- 

 forate ; *****Turrita?, tapering ; ****** 

 Ovatae, &c. ovate and imperforate. 



