WORMS. TESTACEA. 59, Helix. 187 



59:. HELIX. Snail-SIiell. 

 A . Whorls carinate, with an acute edge, 



498. IT. Lapkida. Pale brown, with transverse darker 

 marks, umhiHcate, convex on each side: aperture 

 margined, transverse, oval. 



Br. Zool. t. 83./. 121. Donovan tab. 39/. 2. 



Shell 3 quarters of an inch wide, 3 eighths high,, subpellucid, 

 comprefsed dark hornv with ferrugiuous blotches, very finely 

 striate and minutely roughened like shagreen ; aperture suboval, 

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

 outer-lip reflected ; inner-lip fpread. 



499. H. snbcarinata. White, rather convex, umbiljcate, 

 finely striate across, with 3 fine raised lines qn the 

 larger whorl. 



Montague Brit. Shells, p. 438. tab. 7./. 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 

 second whorl, finely striate across between thq raised lines : 

 ap<Ttuie oval ; outer-lip projecting ; inner reflected, and spreading 

 into a sharp angle. 



509. II . Planorbis. Pale chesuut, flat, concave above, 

 slightly carinate, umbilicate : aperture obliquely 

 oval, rather acute at both ends. 



Linn. Trans, viii. t. 5./. 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. 



5(M. li.planata. Pale cbesnut, flat, carinate in the 

 middle of the whorls : aperture suboval, rather acute 

 at one end. 



Linn. Trant. viii. t. §.f. 14. Montague Supl. t.2$,f. 1. 



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. 



302. H. Vortex. I£orn-eolouri. concave above, with 

 about 6 whorls, carinate at tjie bas£ : aperture oval, 

 flat, acute. 



Br. Zool. t. 83./. 124. Donovan, t. 75. Da Cos^a *.- 4,/. 12. 



Shell hardly half an inch wide? sometimes covered with a 

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

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

 .acute margin. 



13. With rounded whorh) umb%licaft. 



503. H* catnea. Rufous horq .colour, flat, uinbilicate 

 ahove, with 4 cylindrical whorls. 



Br. Zool. t. 83./. 126. Donov. t. 39./. 1. Dj. Costa t. 4,/. 23. 

 Shell about an inch wide, subpellucid, grey when young, 

 . Br'. Zeol.f '1-25. minutely striate longitudinally and acrofs, con- 

 cave at top •• aperture rather lunate, with a thin margin a little 

 oblique downwards. 



501. H. Spirorbis. Horn-colour, flat, concave on both 

 sides, with 5 or 6 cylindrical wjjprls. 



lUnta$ue Brit.Shtlk J>. 4&5« Suppl- t. 25. /. 2. 



