CONCHOLOGY. 107 



strong resemblance. Inhabits the sides of ditches and lakes, both 

 in Europe and America. Seven species. 



Succinea cuculata. Succinea oblonga. 



S amphibia. S. patula. 



S. rubescens. S. pellucida. 



S. aperta.* 



10. Genus A^iricula. PI. X. 



Animal. See Helix. 



Shell. Solid, thick, and smooth, oval, oblong spire ver\' 

 obtuse, aperture entire, enlarged, ear-shaped, much contracted 

 behind ; edges not united, right Hp thick and generally reflected 

 outwardly : the left or columella with one or more teeth or callous 

 plaits. This genus derives its name from its resemblance to the 

 ears of certain animals. It is a land shell found chiefly in the 

 East and West India Islands. Sixteen species. 



Auricula Midae. Auricula scarabseus. 



A. Judae. A. bovina. 



A. sileni. A. caprella. 



A. leporis. A. myosotis. 



A. felis. A. minima. 



A.Dombeiana. A. coniformis. 



A nitens. A.monill. 



A. angiostoma. A. labrella. 



11. Genus Cyclostoma. PI. X. 

 Animal. See Helix. 



Shell. Terrestrial, distinguished from the preceding genera by 

 a perfectly round aperture, reflected lip, and horny operculum, 

 summit papillose; left edge having its origin very detached from 

 the spire. Inhabits the East Indies. A few species are found in 

 America. ' Thirty-eight species. 



Cyclostoma planorbula. Cyclostoma rugosa. 



C. volvulus. C. labeo. 



C. carinata. C. interrupta. 



C. sulcata. C. ambigua. 



C. unicarinata. C. semilabris. 



