INDEX 



The superior figures tell the exact place on the page in ninths; e. g. 77 3 means page 77, 

 beginning in the third ninth of the page, i. e. about one third of the way down. 



Acaste cf. anceps, 20 6 ~21 6 . 

 Acidaspis tuberculata, 25 7 . 



explanation of plate, 106 5 . 

 Actinopteria communis, 34*, 35 1 . 

 explanation of plate, 110 1 . 



insignis, 35 1 . 

 explanation of plate, HO 7 . 



textilis, 34", 35 4 . 



Albany county, Oriskany fauna, 77 3 . 

 Ami, H. M., on fauna of Gasp4 limestones, 



80 4 . 



Anastrophia, 41 8 . 

 Annelids, 26 4 -28 4 . 

 Anoplia nucleata, 51*. 



explanation of plate, 116*. 

 Anthozoa, 62 8 -64. 

 Atrypa reticularis, 15 1 . 

 Aulopora cf. schoharie, 64 3 . 

 Autodetus beecheri, 26 6 , 27 2 . 



explanation of plate, 106 6 . 

 Avicula communis, 34 6 . 



recticosta, 33 2 . 



subequilateralis, 31 7 -32 2 . 

 Aviculopecten sp.? 34 4 . 



Barrett, S. T., on sections exposed at Port 



Jervis, 76 6 . 

 Becraft mountain, stratigraphic structure, 



6 7 -15 3 . 

 Beecher, C. E., Notice of a new Lower 



Oriskany fauna in Columbia county, 6 9 . 



Bellerophon sp.? 28 7 . 

 Beyrich, E., on Helderbergian faunas, 83 1 . 

 Beyrichia sp., explanation of plate, 121 2 . 

 Billings, E., on fauna of G-aspe" limestones, 



80 2 . 

 Brachiopods, description of Oriskany 



species, 38 1 -59 8 ; in the Helderbergian, 



85 4 -86 3 , 90 1 , 92 s -93 6 , 94 4 . 

 Brachyprion aratum, 57 6 . 



majus, 54 9 -56 8 , 57 1 . 



explanation of plate, 118 s . 



schuchertanum, 55 E , 56 6 , 56 8 -57 8 . 

 explanation of plate, 118 1 . 



varistriatum, 55 2 . 

 Bryozoa, description of Oriskany species, 



59 8 -62 5 ; in the Helderbergian, 86 3 , 91 7 , 



94 7 . 



Camarotoechia sp.? 41 5 . 



barrandii, 40 6 . 



dryope, 41 3 . 

 explanation of plate, 112 s . 



(?) fitchana, 40 8 . 



oblata, 41 1 . 

 explanation of plate, 112 9 . 



pliopleura, 41 2 . 

 Centronella, 38 2 . 

 Cephalopods in the Helderbergian, 84*- 



85 1 , 92 7 , 93 9 . 

 Chaetetes (Monotrypella) arbusculus, 64 5 . 



