mm '^" 





CSeological Jjurvey of tUc .§tatc of ^tw forfe. ; 



PALEONTOLOGY: 



Volume VIII. 



AN INTRODUCTION TO THE STUDY 



GEN ERA 



Pal^^ozoic Brachiopoda 



PART I. 



BV 



JAMES HALL, 



STATE GEOLOGIST AND PALEONTOLOGIST. ^ 



^'5 



ASSISTED BY L | \^f^l ^ ^ 



JOHN M. CLARKE. J^'\ 1 1 



3 



ALBANY, N. Y.: 



CHAKLES VAN BENTHUYSEN & SONS. 



1892. 



