112 LAND SHELLS. 



DESCRIPTION. 



Animal. — Color, dull ochre, slaty towards the tail. Coarsely granular upon the neck ; hut 

 from a line running from the dorsal line, where it issues from the shell to the mouth, the 

 granules diminish, and are succeeded hy coarse, undulating, interrupted ridges, radiating in 

 every direction from the aperture, and terminating in a line nearly marginal ; edge simple. 



Shell. — Suhconic, with seven slightly rounded whorls, regularly and gradually diminishing 

 in breadth from the hase towards the apex ; apex obtuse, suture distinctly impressed. Below, 

 flattened, convex, with a deep umbilicus, about one-eighth the smaller diameter of the shell. 

 Aperture ovate, regularly rounded. Lip thickened, white, red, or lilac colored, reflected only 

 below, in some individuals entirely concealing the umbilicus. Columella with a light callus. 

 Epidermis shining, covered with numerous fine, revolving lines. Striae of increase distinct, 

 but very slightly elevated. 



There are several varieties of coloring. The base is uniformly dark, but varies from chestnut 

 color to jet black. Upon the body whorl is a broad revolving black band, enclosed above and 

 below by one of lighter color, white or chestnut. These bands are obsolete in the three whorls 

 nearest the apex. The upper surface is white, light chestnut, or dark brown, in some indi- 

 viduals relieved by irregular patches of black. On some specimens there are faint tracings of 

 intermediate bands, while some are entirely destitute of any bands. 



Greatest diameter, 36 ; lesser, 31 ; altitude, 19 millimetres. 



Geographical distribution. — Collected by Dr. J. S. Newberry, at Portland, Oregon Territory. 

 It has not been found, except in the vicinity of Fort Vancouver, by others, but seems rather a 

 common species in that region. 



Remarks. — This is the largest and finest of the helices of the Pacific coast. It may at once be 

 recognized by its large size and shining, variegated surface, on which the revolving black line 

 contrasts so strongly with the lighter color of the epidermis. 



No. 2. HELIX INFUMATA, Gould. 



Testa depressa, biconvexa, carinata, lenticularis ; nigra, apice rufa ; anfr. 6-7 rugis incre- 

 mentalibus et punctis numerosis minutis tumidis asperati ; sutura impressa ; apertura depressa, 

 obliqua, intus lilacina ; perist. lilacinum, incrassatum, subtus reflexiusculum, umbilicum pro- 

 fundus fere tegens. 



REFERENCE. 

 Helix infumata, Gould, Proc. Boston S. N. H. V, p. 127, anno February, 1855. 



DESCRIl TION. 



Animal. — Not hitherto observed. 



Shell. — Subconic, the upper and lower surfaces equally convex, separated by a decided, 

 though obtuse, carina, which gives the shell a lens-like shape. Epidermis uniformly black, 

 excepting on the four upper whorls, which are light red. Suture distinctly impressed ; whorls, 6, 

 with coarse wrinkles of growth, crossed by fine, almost imperceptible revolving lines, and 

 roughened by small elevated points or tubercles. Below, these points are much more numerous 

 and crowded, the revolving strias obsolete, and incremental wrinkles much less developed. 

 Umbilicus small in proportion to the size of the shell, being only one-fifth the lesser diameter, 

 and almost entirely concealed by the reflected lip. Aperture ovate, flattened, with a slight 





