variety. It is a land? fliell, of a thin fl:ru(n;ure, and 
the inhabiting animal bears the moft ftriking refem- 
blance to the common fnail. It may be added that 
it feems fcarce allowable to rank this fliell under the 
Linnaean genus Bulla, with the general form and 
characfters of which it does not perfectly agree. 
