eS eae es 
180 ILLINOIS ACADEMY OF SCIENCE 
among salamanders (Plethodon erythronotus), coleopterous 
larve (especially of Pyrochoa flabellata), diplopods, chilopods, 
etc. The ease and thoroughness with which this slug covers 
itself with thick mucus is, no doubt, a very successful protec- 
tion against being devoured by other animals. Even Circinaria 
respects this slime. 
Family Endodontidze 
Subfamily Endodontine 
GENUS PYRAMIDULA Fitzinger, 1833 
Subgenus Patula Held, 1837 
112. P. alternata Say—At all localities in all three coun- 
ties. Gregarious; fairly abundant. It seeks moist habitats, 
usually under starting bark, where, with the preceding species, 
it is the first invader. Under stones, leaves, debris, in humus, 
ete. It associates usually with Zonitidze and Pupidz. Consid- 
erable variation in the height of the spire was noted. 
Specimens collected in very humid regions died if placed in 
cages that were not kept moist, but specimens collected in dry 
habitats, did well in the laboratory. If the cages were kept 
moist, these individuals also did well. This species is inclined 
to be quite bold, but when it must retreat into the coils of its 
shell, it secretes an abundance of red, frothy mucus which com- 
pletely fills the aperture. This has saved many an individual 
from the carnivorous snail, but the short-tailed shrew, Blarina 
brevicauda, simply breaks the top of the spire and thus reaches 
its victim. On rainy days P. alternata climbs to a height of ten 
feet or more. Its eggs are white, opaque, agglutinated and 
almost spherical. They measure on the average 2.25 mm. in 
diameter, and the entire egg stage lasts about thirty days. 
113. P. solitaria Say—Brownfield Woods, Champaign Co., 
and Muncie, Hillery, Vermilion Co. Only one specimen was 
found in the Brownfield Woods; it was juvenile, and was found 
buried in six inches of soil. At Muncie, six specimens were 
found in four inches of soil, under a log. Dead individuals 
were quite plentiful at Hillery. This species associates, as a 
rule, with alternata. 
Subgenus Gonyodiscus Fitzinger, 1833 
114. P. perspectiva Say—Brownfield and Cottonwood Wood, 
Champaign Co., Hillery and Oakwood, Vermilion Co. In the 
