SHUMARD—GASTEROPODA. §25 
with a row of rather prominent lengthened tubercles; band 
of sinus moderately broad, excavated, haying a single revoly- 
ing line, and numerous arched transverse striw, corresponding 
in size to those above the ban 
Length, 0.32; width, 0.29. 
form, and Loe.—Young County, near the Indian Reserve. 
Found in bluish-gray marl, associated with Myalina sub- 
quadrata, Chonetes mesoloba, Straparollus cutilloides, Fusu- 
lina, and other characteristic fossils of the Coal Measures. 
Texas State collection. 
PLEUROTOMARIA TENUISTRIATA, Nl. Sp. 
Shell small, turreted, conical, height and width about 
equal; spiral angle 76°; volutions about seven, the last four 
f bg ; 
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margin of the volutions, forming there a neat crenulated 
tat band of sinus narrow, depressed, bearing fine, trans- 
verse arched lines. 
Height and width, 0.35 of an inch. : 
his is a remarkably neat species and occurs with the pre- 
ceding in Young County, near the Indian Reserve. Texas 
State Collection. 
PLevrotTomArRIA RIDDELLII, N. Sp. 
Shell of medium size, regularly conical ; base sharply eari- 
nated ; height a little less than the width; spiral angle 68°; 
Volutions six or seven, flat or very slightly convex, having at 
ase two fine, sharp revolving carine, between which 1s oe 
band of the sinus; last volution flattened convex beneath 
distinct, rounded, unequal, revolving strie, 
by sh ‘atte Back Manual ¢ or less interrupted at 
y Sharp, oblique lines, becoming mpage Sak enter, the 
