HELIX. SNAIL-SHELL. 57 
28. Helix resupinata. Walker, f. 24. 
Shell semitransparent, glossy, horn-color, with the two 
terminal top spires reversed. 
At Sandwich: minute. 
29. Helix globosa. Walker , f. 25. 
Shell globular, opake, white, smooth, glossy, with two 
volutions: aperture roundish. 
At Sandwich: minute. 
30. Helix reticulata. Walker , f. 26. 
Shell white, transparent, elegantly reticulate, slightly 
perforated, with a single volution : aperture rounded and 
margined. 
At Reculver: minute. 
31. Helix unispiralis. Walker , f. 27. 
Shell white, opake, glossy, concave on both sides, with 
a single volution : aperture rounded. 
At Sandwich: minute. 
32. Helix striata. Walker, f. 29. 
Shell transparent, greenish-white, striate : spires three, 
reflected on the back: aperture somewhat oval. 
At Sandwich: minute. 
33. Helix coarctata. Walker, f. 30. 
Shell white, transparent, with two volutions : aperture 
roundish, contracted at the perforation. 
At Sandwich: minute. 
34. Helix tubulata. Linn. Trans . iii. pi. 13. f. 35, 36. 
Shell longitudinally striate, with three volutions: a mar¬ 
gined tube extending beyond the surface of the shell, in 
the place of a perforation. 
At Pembroke: minute. 
35. Helix fasciata. Linn. Trans, v. pi. l.f. 20, 21. 
Shell white, transparent, slightly perforated, with three 
volutions j the first tumid, and marked with three. belts of 
a rich marone color: aperture dilated. 
Pembrokeshire coast; minute. 
£ 
& 
a 
0 
36. Helix 
