WORMS, TESTACEA. 81. Helix. 523 
Inhabits the futhern Ocean; fize and colour of a nut, with a 
white pillar-lip: probably a Nerita. 
Rufefeens. Shell inflated fubumbilicate fragile, with s whorls, the firft 
very large and fubcomprefled the re(t convex: aperture 
femilunar. ; 
Inhabits rivers of Hamburg, Schreet. flufconch t. $. f. 35. 
Shell 6 lines wide, reddiíh with a cheinut band, 
Perwia. Shell umbilicate obtufely fubpyramidal, with 4 convex 
whorls, the firít with an elevated circle the reít fur- 
rounded with a groove: aperture femilunar. 
Inhabits Schrat flu/concb. tab. 6, fig. 10. Shell minute. 
Leviffma. Shell umbilicate oblong, with fmooth round whorls: aper- 
ture orbicular 
Inhabits Schret fufconch. rab. 6, fig. 12. refembles the latt, 
Fafccularis Shell umbilicate pellucid, with 3 whorls divided by a groove: 
aperture orbicular and not margined. 
Schr irt flufconch. tab. 6. fig. 11. 
Inhavits waters of Strafburg & Paris : very rare. 
Shell very broad dufky + jza;/ with a creft befides the 2 tentneuld: 
Holofericea, Shell umbilicate depreffed a little concave above, the firft 
“whorl villous flat: aperture triangular margined. 
Gualt, test. tab. 2, fig. §. Ad. Helv. 6.1. 3. A. f. 16, 
Martini Berl. Magaz, 2. tab, 3. fig. 37. 
Schrat Erdcenchb, tab. 2. fig. 24. = 
Inhabits France and Switzerland: 4 an inch wide. 
Shell with © whorls: aperture w ith a reddifh or white margia 
within, 
Turgida. Shell thin fragile white umbilicate, with fainter bands: 
firft whorl round inflated: aperture fuborbicular and 
not margined. 
Inhabits waters of Hamburg. Schrat flufconch. tab. 5 > fg. 28. 
Shell 3 of an inch wide, with 8 bands and 6 whorls. 
Shell umbilicate pellucid horny tranfverfely ftriate and 
convex, with 6 gradually decreafing whorls and femi- 
lunar aperture. 
Inhabits Schrat flufconch, tab. 5. fig. 324 
Shell 4 or 5 lines in diameter. 
Tenuis. 
\ 
22 Coriaceas 
