342 AMERICAN JOURNAL 



CATALOGUE OF HELICES INHABITING THE WEST 



COAST OF AMERICA, NORTH OF CAPE ST. LUCAS, 



AND WEST OF THE ROCKY MOUNTAINS; 



TOGETHER WITH REMARKS UPON SOME OF THE ANIMALS, 

 AND THEIR SPECIAL DISTRIBUTION. 



BY W. NEWCOMB, M. D. 



1. Helix fidelis, Gray. 

 H. Nuttalliana, Lea. 



This species ranges from tlie banks of the Columbia River, 

 south to Humboldt Bay, in California. It presents variations 

 in the coloring of the shell, sufficiently striking to make seve- 

 ral distinctly marked varieties. We have it passing from a 

 bright buff, with or without chestnut-coloured bands and 

 blotches, into a more or less intense black, with the last va- 

 riety often beautified by a metalic varnish covering the lower 

 half of the last whorl. 



The animal, with one exception, is the most beautiful in 

 coloring, of any of our Helices. When not much extended, 

 the large, flat granulations of a bright, burnt sienna color, 

 studding the superior and anterior surface, sometimes clouded 

 with a patch of burnt amber, with its dark-colored mantle 

 profusely flecked with white, give this animal a pleasing va- 

 riety of warm colors, not often met with in this group of 

 Mollusks. 



2. Helix infumata, Gould. 



South from Humboldt Bay to San Pablo Bay. 



This rare species might, but for the rugose and pileous 

 epidermis and more depressed form, readily be confounded 

 with the preceding. The animal, however, is even more ornate. 

 This species gives place on the south side of the Bay of San 

 Francisco to the following: — 



