134 THE NAUTILUS. 
(3.) Patula strigosa Gld. var. lactea. 
This is a beautiful clear milk-white shell, with 53 whorls, sub- 
carinated at the periphery. In the elevated forms the aperture is 
nearly circular, as broad as high; but in the depressed forms the 
aperture is broader than high, obliquel¥ subangulate. The lip is 
simple, thickened, its terminations joined by a heavy callus,—the 
thickening of the lip and callus is a shade darker than the body of 
the shell. 
Height of the largest specimen 1 inch, breadth 14 inch. 
Habitat, Rathdrum, Idaho. 
The above varieties represent a colony of the largest specimens of 
the Strigosa group that I have collected. They are an important 
and very interesting addition to the series, and serve to confirm my 
previous views on the relationship of what I call the Strigosa group. 
This colony inhabits open places in the dense pine forests of the 
mountains, overgrown with deciduous bushes. They hibernate among 
leaves, brush and roots of trees and in protected and secure places, 
generally on the north slopes of the mountains. 
(4.) Patula strigosa Gld. var. jugalis. 
Shell umbilicated, depressed with numerous prominent oblique 
strie ; spire very moderately elevated or depressed ; whorls 53 some- 
what flattened above, but more convex beneath, the last falling in 
front, with two dark revolving bands, one at the periphery and the 
other above; the body whorl subcarinated at its beginning but 
more rounded as it approaches the aperture; suture well impressed ; 
color ashy white with occasional horn colored stains; umbilicus 
large, pervious, showing the volutions; aperture oblique, ovate, 
but in very depressed specimens the aperture is at right angles with 
the axis of the shell; lip simple, thickened, its terminations approach- 
ing and joined by a thick heavy callus, making the lip in very adult 
specimens continuous. 
Height of the largest specimens 3 inch, breadth 1 inch. 
Height of the smallest specimens 75 inch, breadth 15 inch. 
Habitat, Banks of Salmon River, Idaho. 
This is another interesting form of the very variable strigosa. It 
inhabits stone piles, and other places where it can find shelter and 
protection against the fatal rays of the summer’s sun, close along the 
banks of the river. It is interesting on account of its very depressed 
form and the ovate form of the aperture, the heavy callus, join- 
ing or “yoking” together the extremities of the lip. 
