181 



It dwells abundantly in the rivulets and pools of Europe and North and 

 South America, and also of China and Hindostan. 



Species. 



elevatus, Adams. '35. 



exacutus, Say. 36. 



exustus, Beshayes. 37. 



ferrugineus, Spix. 38. 



glaber, Jeffreys. 39. 



Gruadaloupensis, Soio. 40. 



heliciformis, Roth. 41. 



heloicus, B'Orbigny. 42. 



heliophilus, id. 43. 



hirsutus, Gould. 44. 

 hispidus, Braparnand. 45. 



imbricatus, Miiller. 46. 



Kermatoides, B'Orb. 47. 



lacustris, Liglttfoot. 48. 



lentus, Say. 49. 



leucostoma, Millet. 50. 



lugubris, Wagner. 51. 



lutescens, Lamarck. 

 marginatus, Brapnd. 

 marmoratus, Michaud. 

 montanus, B'Orbigny. 

 nitidus, Miiller. 

 olivaceus, Wagner. 

 orientalis, Lamarck. 

 parallelus, Say. 

 paropseides, B'Orb. 

 parvus, Say. 

 peregrinus, B'Orb. 

 Peruvianus, Broderip. 

 spirorbis, Miiller. 

 tenagophilus, B'Orb. 

 Tondanensis, Quoy. 

 trivolvis, Say. 

 vortex, Miiller. 



Figure. 



Planorbis corneus. PL 17. Fig. 87. Shell, showing its horny sub- 

 stance, discoid convolution of the whorls, and semilunar aperture. 



Family 14. AURICULACEA. 



Shell; ovate, with the columella toothed or strongly plaited ; aper- 

 ture oval, with the lip mostly thickened and toothed or warted 

 within. 



The Auriculacea, like the family Lymnceana, live in stagnant water and 

 yet breathe air, but they live much more out of water, in damp and moist 

 places, in swampy vegetation, among the roots of marsh trees ; and they 

 mostly affect places bordering on the sea and within range of brackish 

 water. Their shells are consequently of more solid growth, and present 

 more brightness and variety of colour. The genera are 



Chilina. Scarabus. Auricula. 



