365 



With refpe-^ to the number of teeth, it is fubjeft to 

 fome variety, having in one or two inftances lately, 

 found it to poflefs fix, and the rudiment of a feventh ; 

 in which ftate Muller has particularly defcribed it, but 

 does not mention the more ufual appearance of that part, 

 which for fome time occafioned us to doubt, whether 

 with propriety, the fynonyms of Muller's fliell, could 

 be affixed to it, though his calling it finijirorfa, which 

 implies a reverfed, or lieterojtrophe fpecies, inclined us 

 to think it the fame. 



This naturalift fays, it is found on rotten wood, but 

 fpeaks of it as rare. 



In the fpecimen now before us, the teeth are fet in 

 pairs, two on the Columella, two on the right fide, and 

 the fame on the left, with the rudiment of a feventh be- 

 tween the two pair on the exterior lip : the plate de- 

 fcribed above, at the angle of the outer lip is lefs 

 confpicuousj being elongated into one of the largeR: 

 teeth. 



Muller fays, ■ ^'Apertura fub-quadrata, vinrgine fum,- 

 "vio albo, arcuato, ad anfracluvi oppojil.um tranfverfo. 

 " Denies in ore apertures f ex minimi alhi cum rudimento 

 "feptimi, tres nempe in externa aperturce, ires in anfrac- 

 " tu vicino." 



Thofe who have an opportunity of examining this 



(hell. 



