ZONITES. 
89 
the name Vitrina margaritacea^ t. 40. f. 54, 55, 56., 
a shell which I have not been able to see; the figure 
is more like a Zonites than a Vitrina, 
The animal is very hardy ; for, according to Nil- 
son, it is found crawling about amongst leaves in the 
southern part of Sweden in the depth of the winter, 
and it is also found in the most northern part of that 
country, 
** Mantle not produced in fronts simply lining the 
cavity of the shelly with a thicker edge or collar 
enclosed within the edge of the shelly in which is 
placed the respiratory cavity, 
f Body and mouth of the shell depressed^ being 
broader from side to side than long from front 
to backy that is to say in the direction of the axis 
of the spiral shell, (Helicina.) 
3. Zonites Montf, (Zonites.) 
Animal with an elongate depressed foot, and a large 
produced central spiral body, covered with (and 
contractile into) a depressed or hemispherical, 
thin, smooth, polished shell, with flattish spire, 
and a large lunate mouth, with thin simple lips, 
which are neither thickened nor reflexed ; the 
tentacles are four, the two lower ones small and 
club-shaped; tongue narrow, with from 30 to 
60 longitudinal series of teeth, with elongated 
apices. 
The tongue of Zonites alliarius^ cellarius, niti~ 
dulus, and radiatulus greatly resemble each other, 
and are somewhat intermediate between Vitrina and 
