5 
THE 
INFERIOR SURFACE 
O F 
THE TRILOBITE 
DISC OYEEED. 
illustrated tottj) Coloured £8otic Is. 
BY JACOB GREEN, M. D., 
PROFESSOR OF CHEMISTRY IN JEFFERSON MEDICAL COLLEGE. 
Multa renascentur quae jam cecidere.—H or. 
PHILADELPHIA: 
PUBLISHED BY JUDAH DOBSON, 88 CHESTNUT STREET. 
1839. 
