120 HELICID^E. 



Shell the tenth of an inch in diameter ; aperture 

 nearly circular, being very little interrupted by the 

 penultimate volution; the peristome margined and 

 flat ; umbilicus large and deep. 



The specimens found in marshy damp situations 

 are marked with elevated cross bands, which are the 

 vestiges of former mouths. Those that are found in 

 dry situations, under stones, in shells, &c., are gene- 

 rally destitute of any such ribs. 



M. Kickx has proposed once more to separate H. 

 costata from H. pulchella specifically, on the ground 

 of a difference between the animals. He describes 

 the animal of H. pulchella as " milk-white ; mantle 

 yellowish ; lower tentacles very short ; " and H. cos- 

 tata as " rufous ; mantle violet ; lower tentacles 

 scarcely visible." This difference does not exist in 

 the English specimens examined by Mr. Forbes or 

 myself, the animal of both varieties agreeing with 

 the description given above of H. pulchella. 



This species is also found in North America, 

 according to Ferussac. 



g. Shell subglobose, perforated or umbilicated, white 

 or reddish, varied with bands ; peristome edged, 

 not spread; periostraca thin, bald; epiphragm 

 membranaceous. Jaw strong, costated in front, 

 and toothed on the edge. (Heliomanes Ferussac.) 



43. 10. HELIX pisana. Banded Snail. Shell sub- 

 globose, with the larger volution rather flat at 

 top, marked with numerous brown and yellowish 

 often interrupted bands; the mouth rounded 

 lunate ; throat mostly rose-colour, (t. 4. f. 30.) 



