HELIX. SNAIL-SHELL. 63 



into a pyramidal form ; but its diameter is much less, and 

 there are seven volutions. 



Although we can hardly venture to offer these two last 

 extraordinary shells as distinct and permanent species, 

 their singular excentricity, nevertheless, deserves a deter- 

 minate record. In the number of volutions, and in many 

 othtr respects, they both differ from the H. scalaris of 

 Muller and other authors, v. m. 

 . 46. Helix bifasciata. Double-banded Snail-shell. 



Lister, pi. 19. f. 14 Dorset Cat. pi. 18. f. 8 and 10 

 Pennant, pi. 85. f. 5. 



Turbo fasciatus. Donovan, pi. 18. f. 1 Montagu, pi. 22. 

 f. 1. 



Shell taper, thin, semitransparent, coarse, wrinkled lon- 

 gitudinally, greenish-white, with longitudinal brown or 

 chesnut stripes, which are generally broken so as to ap- 



Eear like interrupted bands, and are often confluent on the 

 irger volution, forming a band or two, and sometimes they 

 are almost entirely obliterated: spiresnine, a little rounded, 

 and terminating in a rather acute point : aperture nearly 

 oval, the margin thin, reflected a little on the pillar and 

 forming a small hollow behind it : length nearly three 

 quarters of an inch ; breadth not two lines. 

 " Sandy maritime pastures, v. v. 



47. Helix octona. Taper Snail^shell 



Lister, pi. 20. f. 15 Linn. Trans, viii. pi. 5. f. 10. 



Shell very slender, ending in an obtuse point, glossy 

 white or very light horn-color : spires eight, a little 

 rounded and well defined, smooth or very obscurely striate 

 longitudinally : aperture somewhat orbicular, thin and not 

 reflected ; the pillar-lip a little reflected and producing a 

 very obscure and hardly perceptible hollow behind it : 

 length five eighths of an inch ; breadth about one eighth. 



From the next it differs in color, in being of a more taper 

 form and ending more obtusely, in the form of the aperture 

 and slight reflexion of the pillar-lip. From H. Lackhamen- 

 sis it is immediately discriminated, by having no trace of a 

 reflected or margined aperture. 



Supposed, by Dr. Pulteney, to have been found.in Dor- 

 setshire. 



G 2 48. Helix 



