I 



CONCHOLOGY. 



Montfort constitutes another genus of this shell, which he deno- 

 minates Imperator ( Concliyliologie Systematique T, 9., p. 199) in 

 the French, L'Empereur. The olivaceous kind he calls Imperator 

 aureolatus, I'Empereur couronne. The character of this new genus, 

 Imperator, consists in the shell having a regular spire: in being 

 imbricated, or covered with scales, hke tiling upon the roof of a 

 house : the carina of the whorls armed ; the armament, for example, 

 in the shell before us, consisting of a kind of frieze or curled foliage- 

 like plates which succeed each other with great regularity : it has an 

 umbilicus, which, in the present shell is large and deep ; the mouth 

 of the shell angular and entire ; pillar lip spreading somewhat like 

 a fan; and the exterior lip cut off. We have deemed it requisite to 

 advert to these new genera, but as the shell itself is so clearly a 

 Trochus, we have not thought it necessary to remove it from 

 place in the Linnaean System to which Gmelin had assigned. 



