42 HELTCID^. 



Helix radiata^ Da Cosia, Sfc. Zonites rotundatus. 

 Gray, Sfc. 



This common but pretty little shell, is found in almost 

 every locality, and cannot well be mistaken for any 

 other. Its most peculiar characteristic are the radiated 

 striae, which are very conspicuous. It is abundant in 

 almost every locality, being found in conjunction with 

 Zonites and Zua lubrica. By some conchologists, this 

 and the following have been classed with the genus 

 Zonites, but have more relations in common with the 

 Helices. Though the shells of H. rotundata are pretty 

 much of one shape and colour, they admit of one or two 

 distinct varieties, which are not so common as the nor- 

 mal species. 



var. TuRTONi, has the spire quite flattened. 



Hah. At the roots of grass, or under stones, in 

 woods, fields or lanes. Abundant all over the British 

 Isles. A pellucid variety, translucens, is recorded as 

 having been found at Kenilworth Castle, and other 

 places ; it is by no means common. 



H. UMBiLiCATA. Montagu. PI. VI, fig. 25. 



Shell small, wrinkled, opaque, not smooth ; aperture circular ; outer 

 lip acute ; umbilicus very large. 



Zonites umbilicatus. Gray. 



This shell resembles the former in many points, but 

 is much smaller, has a more elongated spire, is not so 

 common, and is found in dry situations. It delights in 

 exposed places, such as the tops of houses or walls. 

 The spire varies, being more elevated in some than 

 others. They show a preference, but are not peculiar 

 to calcareous soils. The colour of the shell is very 

 similar to darker specimens of rotundata, as are also the 

 wrinkles or striae on its surface. Diameter about the 

 tenth of an inch. Animal dark grey, and polished. 



Hah. Dry soils, on walls or buildings, in exposed 

 situations. Generally dififused over the British Isles, 

 and very abundant in some places. 



