944 The American Naturalist. [November, 
NOTES ON A COLLECTION OF MOLLUSKS FROM 
NORTH WESTERN LOUISIANA, AND HAR- 
RISON COUNTY, TEXAS. 
By T. WAYLAND VAUGHAN. 
INTRODUCTORY REMARKS. 
For several years, while resident in Louisiana, I busied my- 
self in trying to bring together as good a local collection of the 
mollusks of the region as possible. During the past summer, 
while at work on the Lowisiana Geological Survey, I continued 
my collecting, obtaining many specimens of land-shells, and a 
few fresh-water shells. "Through the kindness of Mr. George 
Williamson, of Grand Cone, La., of Mr. O. B. Lewis, of Burk 
Place, and Messrs J. D. and J. E. Bailey, of Summerfield, 
coupled with my own efforts, it is likely that I have obtained 
more species from this section than anyone else. In view of 
this it seems highly probable that a few notes on this collec- 
tion would be of passing interest to conchologists. 
The largest part of the section that these remarks apply to 
is included between Ouachita River on the east, a line through 
Alexandria on the south, and the Texas and Arkansas lines, 
but I have transgressed these lines in speaking of a few speci- 
mens collected to the south of it in St. Landry Parish, and 
have included in the discussion, as the title denotes, Harrison 
County, Texas. : 
This list undoubtedly does not contain all of the species 
found in this region, for a few species originally described 
from this section have not been rediscovered. Undoubtedly, 
many more species of Cyrenidx, Pupide, and other families 
will be found later. It is worthy of notice that the collecting 
of my friends and myself have brought to light no species of 
that large family Pleuroceridz (Strepomatidz) that is found in 
such large numbers in the southern States east of the Missis- 
sippi River. Some species of this family have been noted from 
. Louisiana. | 
