66 MOLLUSCA. 
Figure 43, animal with the shell; 43a, the aperture, and 43 b, the 
base of the shell. 
Heix Nurrauiiana (Lea). 
Testa sub-conica, subtus conveza, umbilicata, tenuiter striata ; colore 
superné luteo aut fusco, subtus castaneo ; spira anfractibus septem, 
fascia nigra aut castanea cinctis: apertura subrotundata, depressa, 
intus fasciata ; labro subreflexo ; columella levi. 
Helix Nuttalliana, Lea; Trans. Am. Philos. Soc., vi. 88, pl. 23, f. 74. 
Bixney; Boston Journ. Nat. Hist., iii. 369, pl. 12. United States 
Land Mollusks, 1. 159, pl. 18. 
AnimaL coarsely granular upon the neck, of a dull ochre colour, 
slaty posteriorly ; on the sides 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. 
This species seems to be widely distributed, and quite common. It 
was found at most places visited by the Expedition, along the Colum- 
bia River, and at Puget Sound. 
SHELL more variable in its colouring than any other one found 
in temperate America; the variations consisting in the presence or 
absence, the greater or less width and number of dark bands, while 
its form is well characterized and constant. It is pronounced by Dr. 
Pfeiffer to be H. fidelis, Gray ; but as there are other species in that 
region corresponding equally well to Gray’s indefinite description, I 
think it proper to retain Mr. Lea’s name until the identity can be fully 
settled. 
Figure 38, shell, with the animal. 
Hetix Townsenpiana (Lea). 
Testa orbiculato-conveza, luteo-rufescens, rugosa, umbilicata ; apertura 
subrotundata ; labro albo, reflexo ad basim interne incrassato ; colu- 
mella levi ; basi tumido. 
