WORMS. TESTACEA. 59. Helix. JW 



H7. II. obscura. Brown-horny, opakc, oval-oblong, 

 with 5-7 rather rugged whorls, slightly perforated : 

 aperture roundish-lunate, with a white lip. 



Linn. Trans, .viii. t. 5./. n. Montague suppl t. 22./. 5. 



Shelly eighths of an inch long, rather obtuse, with rather roun- 

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

 more opake. 



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

 with 6 somewhat rounded whorls, imperforate : 

 aperture oval. 



linn. Trans, viii. t. 5. /. 12. Br. Zool. t. 82./. 118. 



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

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



£49. H. vitrea. White, smooth, subcylindrical, with 4 

 rounded whorls : aperture oval, contracted, at one 

 end. 



Montague Brit. Shells. p. 321. tab. 12./. 3. Turbo. 



Shell Bin 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. Sheltsp. 320. tab. 12./. 5. Turbo. 



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

 taper. 



551. H. arenaria. White, conic, with 5 rounded whorls 

 strongly striate longitudinally and very finely decus- 

 sate : aperture oval. 



Montague p. 322. t. 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 striae, add in having the aperture con- 

 tracted towards one end. 



E. Oval 9 imperforate. 



$$2. 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./. 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 very large ; lip thin. 



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

 cylindrical, pellucid: aperture oval oblong. 



Montague Brit. Shell, p. 369. tab. 16./. 7. 



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

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

 ture is fmaller and more oblong. 



554. H.palustris. Brown, horny, oblong-, with 6 rather 

 rounded whorls : aperture oval. 



Br. Zool. t. 86./. 136. B. Dtnov. t. 175,/. 1. 2. Mont. t. 16./. 10. 



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 frdm 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. 



R 



