ADDENDA AND CORRIGENDA. 
Page 14, add to reference of A. latjtus, plate 81, fig. 5. 
Page 30, for A. elongatns read A. celsus. 
Page 54, add to reference of L. priamus, plate 82, fig. 6. 
Page 74, line 2, for LXXXI read LXXXII. 
Page 82, line 3, for P. crenulatus read C. crenulatus. 
Page 114, line 23, for recticulata read reticulata. 
Page 157, line 11, for anterior read posterior. 
Page 167, for A. Bigsbyi read L. Bigsbyi. 
Page 220, line 8, for N. Y. read Pa. 
Pages 186 and 23S, lines 4 and 7, respectively, for Alleghany read Cattaraugus. 
The names Philipsburgh and Rockville, are localities referred to in the earlier Geological Reports, 
from which many fossils were obtained. The former (Philipsburgh) is now known as Belmont. Rockville 
was a settlement near the mouth of Rock creek on the Genesee, in the township of Belfast, during the con¬ 
struction of the Genesee Valley Canal. The name does not now appear in the Gazetteer. 
