239 



The " Nomenclature/' which is inserted imme- 

 diately after the " Introduction," refers to the 

 (Generic and Specific Characters of Shells, among 

 which Colours ought not, properly speaking, ever 

 to be ranked : they distinguish varieties and indi- 

 viduals which differ in the same species, and, being 

 liable to uncertainty and change more than any 

 other feature, are to be considered as the last in 

 value. To the last place, therefore, they have 

 been consigned in the present work, which has 

 been arranged as much as possible upon the re- 

 gular gradation necessary to the description of any 

 subject of Natural History, according to the spirit 

 of the Linnsean System. 



In the following list those colours only are enu- 

 merated, which occur in the Latin descriptions of 

 Testacea. The name of a well known pigment, or 

 some other permanent standard, is affixed to those 

 respecting which there can be any doubt. Where- 

 ever the termination ish is used, it implies that an 

 inconsiderable portion of the colour tinges white, 

 or enters into combination with the other men- 

 tioned ; — as reddish yellow, signifies that yellow 

 is the principal, and red but a small ingredient in 

 the hue. 



