118 WEST AMERICAN (SHELES 
while between these are little tubercles, giving it 
the appearance of mosaic work. When touched it 
secretes a glutinous mucous. It is liable to become 
a great pest in gardens, doing most of its ravages 
in the night season. 
Limax campéstris, Binney, the Lawn Limax, is 
closely related to the last species, but is smaller, 
more semi-transparent, and does not so readily 
secrete mucous. It is about an inch long, the body 
is cylindrical, the mantle oval and fleshy, the back 
tubercled and furrowed, the foot narrow and whit- 
ish. It has no spots or markings, and varies in 
color from amber to black. I have sometimes seen 
great numbers of these little black slugs upon the 
lawn at Mills College. 
Limaxw héwstom, J. G. Cooper, Hewston’s Li- 
max, is found in San Francisco, Los Angeles, and 
other places. It is a dark colored slug, two inches 
long, the back being strongly ridged and higher 
than the front of the body. The height of the 
body is twice the width of the foot, the base of 
which is whitish in color. 
Limax montanus, Ing., the Montain Limax, is 
a stout, blunt, bluish-grav slug, an inch or more in 
length, found in Montana and Colorado. 
Vitrina pfeifferit, Newe., Pfeiffer’s Glass-snail, 
is a little mollusk resembling a slug, but with a 
small, shining, greenish white, spiral shell of three 
whorls, 5mm. in diameter. It is generally found 
at high altitudes. The aperture is large, the lip 
thin, and the shell too small to admit the whole 
animal. 
