VOL. 1. | Variation in Shells. 333 
and depression of the spire; color is rigid, but the band is frequently 
absent. 
Helix KellettiFbs. Santa Catalina Island. 
This species has a greater geographical range than the preceding, 
including Helix Stearnsiana Gabb, as a variety. 
I refer all the specimens I have collected on the main land from 
San Diego south to the variety 7. Stearnsiana. . 
The following measurements and color varieties refer to the 
typical form which is restricted to Santa Catalina Island, and repre- 
sents the varying conditions and character of an isolated island 
‘colony. 
Judging by the texture and the characters and form of the shell, 
it seems to have evolved from the Wickliniana- Californiensts group. 
Largest specimen: greatest diameter, 30 mm.; altitude, 23 mm. 
Smallest specimen: greatest diameter, 22 mm. ; altitude, 16 mm. 
A.— Var. castaneus., Uniform, plain; somewhat shining chestnut 
color, dirty white around the umbilical region, and a poorly defined 
whitish band at the periphery. 
Var. nitidus. Uniform, translucent, shining darie horn color, with 
a poorly defined dark band, coalescing with a poorly defined 
whitish band below it, at the periphery ; spire faintly flecked with 
ashen gray. 
Var. multilineatus. Shell marked by alternate shades of ashen 
white, chestnut or brown, arranged in an irregular series of revolv- 
ing and sometimes wavy lines, with a broader and poorly defined 
band at the periphery ; markings finer beneath than above. 
Var. frater. Shell of a beautiful uniform horn-buff color, some- 
times fading into lighter horn-color, with a darker band at the peri- 
phery, and numerous faint, alternate revolving lines of ashen and 
dark-horn color above and below; generally, not always, lighter 
colored beneath, and sometimes with a whitish zone beneath the 
band at the periphery. 
Var. Californica. The shell is colored with a darker shade of 
uniform buff than the above, dark band at the periphery, generally 
uniform in coloring above and below ; sometimes flecked with 
squarish dots. | 
Var. Forbesit. Ground coloring whitish buff, with a revolving 
series of poorly defined and coalescing lines, bands and blotches. 
