WORMS. TESTACEA. 59. Helix. 193 



547. II. obscura. Brown-horny, opake, oval-oblong, 

 with 5-7 rather rugged whorls, slightly perforated : 

 aperture roundish-lunate, with a white lip. 



2.i an. Trans, viii. t. $./, n. Montague suppl t. 22. /. 5. 



Shell 3 eighths of an inch long, rather obtuse, with rather rotin- 

 . ded whorls : refembles the laft, but is about half the size, and 

 more opike. 



518. H. lubrica. Horn-colour, smooth, rather taper, 

 with 6 somewhat rounded whorls, impcrforate : 

 aperture oval. 



Linn. Trans, viii. t. 5. f. 12. Br. Zool. t. 8i./. 118. 



She II a quarter of an inch long, glossy, with a fulvous or yellow- 

 ish tinge, rather obtufe : lip thickish, generally reddish-brown. 



549. H. vitrea. White, smooth, subcylindricai, with 4 

 rounded whorls : aperture oval, contracted, at one 

 end. 



Montague Brit. Shells. p. 321. tab. is./. 3. Turbo. 



Shell an eighth of an inch long, pellucid, rather obtufe : aperture 

 not margined. 



550. H. Punctura. Yellowish-white, conic, with 6 globular 

 reticulate whorls: aperture suborbicular. 



Montague Br. Shells p. 320. tab. 12./. 5. Turbo. 



Shell the tenth of an inch long, very minutely decussate, rather 

 taper. 



35!. H. arenaria. White, conic, with 5 rounded whorls 

 strongly striate longitudinally and very finely decus- 

 sate : aperture oval. 



Montague p. 322. /. 12./. 4. Turbo decussatus. 



Shell hardly the eighth of an inch long, rather glossy, not much 

 pointed : lip thin : differs from the last in being more cylindrical, 

 in its stronger longitudinal strix, and in having the aperture con- 

 tracted towards one end. 



E. Oval, imperf orate. 



552. H. stagnalis. Horny, oval tapering to a point, 

 somewhat angular : aperture oval, large. 



Br. Zool. t. 86. /. 136. Donovan, t. 51. /. 2. Da Costa t. 5.7. u. 



Shell nearly 2 inches long, whitish, grey or dusky, very thin, 

 with 6 or 7 whorls, the first very large and marked with a few irre- 

 gular tranfverfe ridges, the rest fuddenly tapering to a fine point ; 

 aperture vei*y large ; lip thin. 



553. H. fragilis. H orn-colour, oval tapering to a point, 

 cylindrical, pellucid: aperture oval oblong. 



Montague Brit. Shel/. p. 369. tab. i6./. 7. 



Shell extremely tender, pellucid, rcfembling the last, but the 

 whorls turn more obliquely, the larger not fo tumid, and the aper- 

 ture is fmaller and more oblong. 



554. H.palusti-is. Brown, horny, oblong, with 6 rather 

 rounded whorls : aperture oval. 



Br. Zool. t. 86. /. 136. B. Dtaov. f. 175,7. i. 2. Mont. t. i6./. to. 



Shell about 3 quarters of an inch long, grey or covered with a 

 brown skin, minutely striate longitudinally and acrofs, purplish or 

 brownish within : differs from S. stagnalis in being lefs, not fo 

 brittle, not tapering to fo fine a point, and in the larger whorl 

 being lefs tumid : lip reflected. 

 i 



