. VI. NOMENCLATURE. 203 



The trivial name is a word added to the name of 

 the genus, in order to form a distinctive appellation 

 for a species. f 



Trivial names applied to permanent species, the 

 originals of which are unknown, may be taken from 

 various circumstances 1 . from char act eristic marks 

 of the species, e. g. Phytotithm striatus P//y- 

 tolithus verrucosus &c. &c. 2. from the conn- 

 tries in which the species were originally discovered. 

 e. g. Entomolithus derbiensis Conchyliolithtf* tiro- 

 lensis, &c. &c. 3. from the resemblance of the reli- 



t In writing or speaking of permanent species of rcliquia, of 

 which the originals are unknown, it will generally be found con- 

 venient to use the family name, with the generic and trivial 

 ones as, CONCHY L. Anomites striatus CONCHYL. Anomites 

 productus. &c. &c. In this mode, a more determinate idea in 

 given of the rcliquium, than if the trivial name were used with 

 the generic one alone. Nor is the insertion of the family name 

 between the generic and trivial appellations, as just given, con- 

 trary to the practice of our first naturalists, who, in treating of 

 detached species belonging to genera in which Linneus found it 

 necessary to establish families or subdivisions, frequently use the 

 family name in conjunction with the generic and trivial denomi- 

 nations as, " PHAL.ENA Geometra rufata PAPIUO Eques 

 Hector -PHAL^ENA Tinea pratella" &c. 



When the original of a refiquium is known, the family name 

 must of course be omitted, in order to avoid an unnecessary repe- 

 tition Vide examples, given in the text, of the formation of the 

 trivial names of species, whose originals are known in the recent 

 state. 



