WORMS. TESTACEA. 81. Helix. 5Ir 
Inhabits frefh waters of Europe and Coromande/, from a line to an 
inch in diameter: /hz// chefnut, brown, rufous, whitifh, yel- 
lowifh or blueifh, polifhed and very finely ftriate traníverfely: 
avhorls 4 or 5, rarely turned contrary : the ixbaditant is black, 
with dirty-grey tentacula, and produces a ícarlet but not du- 
rable dye. 
Spirordis. Shell concave each fide, flat, whitifh, with 5 rounded 
whorls. 
Martini Berl. Mogaz. 4. tab. 8. fig. 20. 
Inhabits ftagnant waters of France and Germany. 
Shell 1i line diameter, pellucid, yellowifh and hardly ftriate: 
whorls 4 or 5: aperture flightly lipped. 
Polygyrae Shell flattifh, orbicular: aperture oval, the lip fringed. 
Inhabits Born, Muf. Caf. test. tab. 14. fig. 19, 20. 
_ Chemn, conch: 9. tab, 127, fig. 1124, 1125. 
Contorta. Shell fubumbilicate, flat each fide, equal: aperture linear, 
arched. 
Petiv. Gaz. tab. gz. fig. 8. Schrat, flufc. t. 6, f. 29. 
Martini Berl. Magaz. 4- tab. 8, fig. 21... 
Chemn. conch. 9. tab. 127. 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 zzhabitant grey, with 
tentacula edged with white. 
Nitida. Shell polifhed, yellowifh, above convex, umbilicate, be- 
neath flat, perforated. 
Martini Berl. Magaz. 4. tab, 8. fig. 22. 
Schret. flufeonch, tab -5. fig. 27. 
Inhabits ditches of Denmark: 1--3 lines in diameter. 
Shell diaphanous, highly polifhed, fometimes brown: avhorls 
3--5, the outmoft much broader than the refit: aperture heart- 
fhaped: inhabitant black, the tentacula tipt with white, 
when young entirely white. 
Alba. Shell white, umbilicate each fide: aperture dilated. 
Petiv. Gaz. tab 92. fig 7. Schraet. flufe. tab. 5. f. 12. 
Martini Berl. Magaz. 4. tab. 8. fig 23. 
Inhatits Dezmark, on aquatic plants: 1--2 lines wide. 
Shell pell:cid, above flattifh, beneath convex; w/orls 4, round, 
with very fine decufiate {trie, the outer larger than all the 
others: apercure large, oblique: ixbabitant grey, with white 
. tentacula and black eyes, 
Similis 
