WORMS. TESTACEA. 81. Helix. 523 



Inhabits the fjuthern Ocean-, fize and colour of a nut, with a 

 white piJlar-Jip : probably a Ncrita. 



Rufefcens* Shell inflated fubumbilicate fragile,. with 5 whorls, the firft 

 very large and fubcomprefled the reft convex : aperture 

 femilunar. 

 . Inhabits rivers of Hamburg* Schrcet .fiufconch t . 5. f % 35, 

 Shell 6 lines wide* reddiih with a -chsfnut band, 



Pervia. Shell umbilicate obtufely fubpyramidal, with 4 convex 

 whorls, the firfl with an elevated circle the reft fur- 

 rounded vyith a groove: aperture femilunar. 

 Inhabits Schreet flafionch* tab* 6. fig. 10. Shell minute. 



Lavijfima* Shell umbilicate oblong, with fmooth round whorls : aper- 

 ture orbicular 

 Inhabits. Scbrcetfiufccncb.tab- 6*fig. 12. refembles the lafh 



T.afcicularis Shell umbilicate pellucid, with 3 whorls divided by a groove: 

 aperture orbicular and not margined, 

 Schr xt Jluj'conch . tab. 6. fig. 1 1 . 

 Inhabits waters cf Sira/burg >& Paris : very rare. 

 Shell very broad duiky ; jnail with a creft befides the 2 tentacula. 



Holcfericea. Shell umbilicate deprelfed a little concave above, the flrft 

 whorl villous fiat : aperture triangular margined. 

 Uj Gualt, test*tab* 2, fig. 5. Ad. Hefo. 5./. 3. A.f. 16, 

 Martini BerL Magaz* 2, tab, 3. fig* 37. 

 Schrcet Erdconch* tab. 2. fig* 24, A. 

 Inhabits France and Switzerland : \ an inch wide. 

 Shell with 6 whorls : aperture with 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. Schroct filufecwh. tab. 5. Jig. 28. 



Shell I of an inch wide, with 8 bands and 6 whorls. 



Tenuis* Shell umbilicate pellucid horny tranfverfely ftriale and 

 convex, with 6 gradually decreafing whorls and femi- 

 lunar aperture. 



Inhabits Schrcet jiufconch, tab, 5. fig* 32, 



Shell 4 or 5 lines in diameter. 



3 ^ 2 Coriaceas 



