bs uN F 
. P. Stevens on new Carboniferous Fossils. 261 
Dimensions: height 0:7 of an inch, width of body whorl 0°5 
ofan inch. ae 
_, Geological position: in a thin band of argillaceous limestone - 
twenty feet below the Danville coal seam. 
Locality: Danville, Ill. 
, A. ovalis, n.s. Shell galeated. Volutions two and one- 
half, contiguous, the last whorl great] y inflated. Spire delicate, 
depressed. Surface smooth, mouth oval. 
Height 0°10 of an inch, width of body whorl 15 of an inch, 
n Archimedes beds of mountain limestone. 
Il. 
Union Co., I 
bt 
and umbilicus in the specimen covered with the matrix. La- 
brum t ick. The surface is of cinnamon color and polished, 
men, what portion is left is rugose. Right valve: beak acute, 
‘pressed to the hinge-line, polished. ‘Disk rounded, surface 
Geo ogical position : in the apper shales of the coal measures, 
ll. 
1 Lena (Schumacker).—1. ZL. bellistriata, n.s. Shell twice as 
; id : 
Tor to the middle of the shell, sharp incurved, i 
4 towards the posterior extremity. Margins smooth. Hinge- 
he curved, armed with twenty-five teeth, about five of them 
Baye Ustered under the beak, and weaker spas renee — 
utch 9 . Surface marked by numer- 
eon long, as and narrow. a disk but fading before 
‘rior extremity broadly rounded. Posterior produced, at- 
‘ and acutely roun : 
