SHUMARD AND SWALLOW—NEW FOSSILS. 209 
. jor margins. 
Length, 2.18; greatest width near the posterior SREY, 
1.16; greatest thickness a little back of the beaks, 0.85. 
wn’s collection, from near the junction f° the Coal 
Wisseren at Portan Rescle ts Citian Pate Bea 
Arca cuspipata, Swallow. 
anterior margin forming an acute angle with the straight car- 
dinal Gina maspin ufc marked with es rounded, biiodidtie 
“aged pais ak not seen, as our specimens show 
ope cast fale 
ae 1.25 ; breadth, 1.19; thickness, 0.91 
“ Maj. Ha gi Sa ction, : from the = Neve Coal Measures near 
ew aL subi P 
eas ‘olnen, in incurred, intned forward, approximate 
it 18 SOME lontiod Belial ns narrower at the 
emity, ah mates) with a few rd oad ia costee 
