IE EO Ne ee gE ee Toke = RL LEON NE | ee eee eee ae a 
J. W. Dawson—Paleozoie Land Snails. 411 
course also a strong mark of distinction. The shell is thin, and 
from its black color and failure to show structure under the 
microscope, I infer that it must have been of a horny or cor- 
neous texture, with little calcareous matter. The matrix is 
light colored and concretionary, and somewhat hard and cal- 
careous, 
As compared with modern American species, P. Vermilion- 
ensis is very near to several of the smaller forms with teeth in 
the aperture. In its form and aperture it approaches closely 
to P. (Leucochila) corticaria of Say, or to the immature shell 
of P. rupicola. It has also some resemblance to the western 
species P. hordeacea Gabb, from Arizona. 
This shell was discovered by the late Mr. F. H. Bradley in 
1869, in concretionary limestone accompanying the underclay 
of Coal No. 6, Wabash Valley Section, at Pelly’s Fort, Vermil- 
ion River, Illinois. In the first notice, which appeared in the 
Report of the Geological Survey of Illinois, it was referred to 
Pupa vetusta, but was subsequently described by Mr. Bradley 
in the American Journal of Science, under the name above 
cited. 
Iam indebted for specimens of this shell to Mr. John Collett, 
of the Geological Survey of Indiana, and also to Mr. W. Gurley, 
of Danville, Illinois. 
4. Zonites (Conulus) priscus Carpenter. (Figs. 10 and 11, and 14d.) 
[Quarterly Journal of Geological Society of London, Nov. 1867. Acadian Geol- 
ogy, 2d edition, 1868, p. 385.] 
Description.*—Shell small, helicoid. Length two and five- 
tenths millimeters, width two and eight-tenths millimeters. 
Spire little elevated. Nucleus small. Whorls four, somewhat 
flattened, with the suture little impressed. ase somewhat 
excavated with large umbilicus. Aperture oblique, suboval, 
somewhat regularly rounded. Lip simple. Surface marked 
with uneven strie and somewhat more conspicuous ridges of 
growth. Angle of divergence about 130°. Shell thin and 
probably horny. 
This little shell was discovered in 1866, in the bed already 
referred to as the lowest of those at the South Joggins in which 
Pupa vetusta has been found. Shortly after I had discovered 
ie Slightly modified from Carpenter. 
