HELIX. 159 



B. umbilicus open, 

 c. Aperture without teeth. 



28. HELIX NUTTALLIANA. 



PlatbScVIII. 



H. testa sub-conica, subtus convexa, umbilicata, tenuiter 

 striata ; colore superne luteal aut fusca, subtus castanea ; 

 anfractibus scptem, fascia nigra aut castanea cinctis ; aper- 

 tura sub-rotundata, depressa, intus fasciata ; labro sub- 

 reflexo ; columella leevi. 



fiYNONYMS AND KEFEHENCES. 



Helix niutalliana, Lea, Am. Phil. Trans. VI. 88, pi. 23, f. 74. 



BiNNKY, Boston Journ. Nat. Hist. III. 3U9, pi. 12. 



De Kay, Nat. Hist. New York, p. 40. 

 Helix fidelis, Gbay, Proc Z. S. July, 1S34, p. 67. 

 Pfeiffeb Monog. Hclic. Viv. I. 338. 



DESCRIPTION. 



Animal. Color dull ochre, slaty towards the tail. 

 Coarsely granular upon the neck ; but from a line run- 

 ning from the dorsal line, where it issues from the shell, 

 to the mouth, the granules diminish, and are succeeded 

 by coarse, undulating, interrupted ridges, radiating in 

 every direction from tlie aperture, and terminating in a 

 line nearly marginal ; edge simple. 



SuELL sub-conical ; epidermis light yellow or browrt- 

 ish on the upper surface, with a black or chestnut 

 colored, revolving band visible on the four outer whorls, 

 the lower surface dark chestnut ; suture distinct, im- 



