WORMS, TESTACEA. 59. Helix. ItT! 



59. HELIX. Sni7-SAe. 

 A. Whorls carinale,,with aniticute edge. 

 493. II. Lapiddn. Pale brown, with transverse darker 

 marks, unibilicate, convex on each side: aperture 

 margined, transverse, ova!. 



Rr. Zoo!, t. 83. /. 121. Donovan tab. %gf. 2. 



Shell 3 quarters of an inch wide, 3 eighths high, . suhpclluoid, 

 comprefsed dark horny with ferruginous blotches, very finely 

 striate and minutely roughened like shagreen : aprrture suboval,' 

 transverse, very slightly dilated, with an acute white margin; 

 outer-lip reflected ; inr.er-lip fpread. 



499. II. subcarinata. White, rather convex, umbilicate, 

 finely striate across, with 3 fine raised lines on the 

 larger whorl. 



Montague Brit. Shells. p. 438. tab. j.f. 9. 



Shell the tenth of an inch wide, more than half as much high, 

 subopake, with 2 ridges round the base of the larger whorl, and 

 one on the upper-part, which continues round the middle of the 

 s'.-.rond whorl, finely striate across between the raised lines : 

 apcrtuie oval ; outer-lip projecting ; inner reflected, and.,spreading 

 into a sharp angle. 



509. II. Planorbi*. Pale chcanu f , flat, concave above, 

 slightly c.irinate, umbilicate : aperture obliquely 

 oval, rather acute at both ends. 



linn. Trans, viii. t. $.f. 13. Br. Zool. t. 83. /. 123. 



Shell about 5 eighths of an inch wide, pale and pellucid when 

 empty, blackish when filled with the inhabitant, of 4 finely striate 

 whorls which have a prominent margin at the base. 



501. ll.planata. Pale chesnut, flat, curinate in the 

 middle of the whorls : aperture suboval, rather acute 

 at one end. 



Linn. Tranr. viii. t. $.f. 14. Msntague Sup!, t. "2.5. f. i. 



Shell half an inch wide, resembling the last, but the margin of 

 the whorls is placed in the middle, and the. aperture is acute at 

 one end only. 



502. JI. Vortex. Horn-colour, concave above, with 

 about 6 whorls, carinate at the base : aperture oval, 

 flat, acute, 



Jir. Zool. t. 83. f. 124. Donovan, t. 75. Da Costa t. \.f. 12. 



Shell hardly half an inch wide, sometimes covered with a 

 greenish or rufous brown skin : whorls 6 or 7, flat -and not umbili- 

 cate underneath : aperture compressed, a little angular, with au 

 acute margin. 



B. With rounded whorls 3 umbilicate. 



503. II. cornea. Rufous horn-colour, flat, umbilicate 

 above, with 4 cylindrical whorls. 



cave at tup . upcuure 

 oblique downWards. 



50>. H. Spirorbis. Horn-colour, flat, concave on both 

 skiesj with 5 or 6 cylindrical whorls. 



Mentdgus frit, Shells f. $$$. 5/0/ t. 23. /. 2, 



