HELIX. 159 



B. umbilicus open, 

 c. Aperture without teeth. 



28. HELIX NUTTALLIANA. 



PLATE XVIII. 



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

 striata ; colore superne lutea aut fusca, subtus castanea; 

 anfractibus septem, fascia nigra aut castanea cinctis ; aper- 

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

 reflexo ; columella Isevi. 



SYNONYMS AND REFERENCES. 



Helix nuttaUiana, LEA, Am. Phil. Trans. VI. 68, pi. 23, f. 74. 



BINNEY, Boston Journ. Nat. Hisl. 111. 369, pi. 12. 



DE KAY, Nat. Hist. New York, p. 46. 

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

 PFEJFFER Monog. Helic. 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 the aperture, and terminating in a 

 line nearly marginal ; edge simple. 



SHELL sub-conical ; epidermis light yellow or brown- 

 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- 



