WORMS. TESTACEA. 81. Helix. 



5" 



\pirorbis. 



Inhabits frefh waters of Europe and Coromandel, from aline to art 

 inch in diameter: jhell chzinut, brown, rufous, whitifh, yel- 

 lowifti or blueifh, poliflied and very finely ftriate tranfverfely: 

 whorls 4 or 5, rarely turned contrary : the inhabitant is black, 

 with dirry-grey tentacula, and produces a fcarlet but not du- 

 rable dye. 



Shell concave each fide, flat, whitifh, with 5 rounded 



whorls. 

 Martini BerL Mo gaz, \. tab. 8. fig. 20. 

 Inhabits ftagnant waters of France, and Germany. 

 Shell if line diameter, pellucid, yellowifh and hardly ftriate: 



whorls 4 or 5 : aperture flightly lipped. 



Folygwas Shell flattifh, orbicular: aperture oval, the lip fringed. 



Inhabits Bern, Muf. Caf.test. tab, 14. fig. 19, 20, 



Chemn.eonchi 9. tab, 12J, fig. 1124, 1125. 



Contorta. 



Nitida. 



Alba, 



Shell fubumbilicate, flat each fide, equal : aperture linear, 



arched. 

 Petiv, Gaz. tab. 92. fig. 8, Schrat.flufc. t. 5./. 29. 

 Martini BerL Magaz. 4. tab, 8, fig. 21. 

 Chemn. conch. 9. tab. I2j t f. 1126. 

 Inhabits ftagnant waters of Europe : 1—2 lines wide. 

 Shell opake, brown, chefnut or fulvous, with a pellucid centre : 



whorls 3—7, very clofely united : the inhabitant grey, with 



tentacula edged with white. 



Shell polifhed, yellowifh, above convex, umbiiicate, be- 

 neath flat, perforated. 



Martini BerL Magaz. 4, tab, 8,y%. 22. 



Schrat fufconch. tab. 5. fig 27. 



Inhabits ditches of Denmark: 1-3 lines in diameter. 



Shell diaphanous, highly polifhed, fometimes brown: whorls 

 3—5, the outmoft much broader than the reft : aperture heart- 

 fhaped : inhabitant "black, the tentacula tipt with white, 

 when young entirely white. 



Shell white, umbiiicate each fide: aperture dilated. 



Petiv. Gaz. tab 92. fig. 7. SchratSfiufc, tab. 5. /. 12. 



Martini BerL Magaz. 4. tab. 8. fig. 23. 



Inhabits Denmark, on aquatic plants: 1—2 lines wide. 



Shell pellucid, above flattifh, beneath convex ; whorls 4, round, 

 with very fine decuffate ftriae, the outer larger than all the 

 others; aperture large, oblique: inhabitant grey, with white 

 tentacula and black eyes, 



Stmilis 



