M I T R A Icrruginea. 

 Thick-lipped Mitre. 



Specific Ciiaracteu. 



M. iestu nulilA, maculisque ferrugineis interstinctd ; costis (ransvcrsis, elevatis ; 

 labia cxtcriore crasso, obtuse crenuto ; columella ^-plicata. 



Shell clouded and spotted with ferrugineous, with transverse elevated 

 ribs; outer lip thick, obtusely crenated; pillar four-plaited. 



M. ferruginea. Lam. Ann. du Mu$. vol. 17. p. 200. 



Young. Vol. vitulina. Dill. 55^.— -Martini 4. 149. 1380 & 1. 



Fanefy more elongated. Vol. abbatis. Dill. 557. Chamiitz i\. t. \77. 

 1709 & 10. 



This (a common shell) can be no other than the M. ferruginea 

 of Lamarck, though neither that author nor any other has noticed 

 its primary distinguishing character, that of the uncommon thick- 

 ness of the outer lip at the margin, which is also divided into 

 convex obtuse crenations; in young shells this is not apparent; 

 such is Martini's figure. Mr. Dillwyn has changed Lamarck's 

 name to I itidina for this, and given the name of Abbatis to the 

 variety more lengthened, figured by Chemnitz ; but which, from 

 specimens now before us, we consider with Lamarck only as a 

 variety, possessing all the essential characters here given to 

 both. 



