6efllogic.il grotiteg of the State of $Mu gork. 



PALEONTOLOGY: 



Vol. V. Part I. 



LAMELLIBRANCHIATA 



L 



TEIXIT ^.nSTID PLATES. 



CONTAINING DESCRIPTIONS AND FIGURES 



OF THE 



MONOMYAEIA 



OF THE 



UPPER HELDERBERG, HAMILTON AND CHEMUNG GROUPS. 



By JAMES HALL, 



STATE GEOLOGIST. 



3 i--z- 1 



ALBANY, N. Y.: 



CHARLES VAN BENTHUYSEN & SONS. 

 1884. 



