INDEX 



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

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



Bellerophon sp.? 28'. 



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



Acaste cf. anceps, 20^-21*. 

 Acidaspis tuberculata, 25'. 



explanation of plate, 106^. 

 Actinopteria communis, 34*, 35^ 

 explanation of plate, 110^. 



insignis, 35i. 

 explanation of plate, 110'. 



textilis, 349, 35^. 

 Albany county, Oriskany fauna, IIK 

 Ami, H. M., on fauna of Gasp^ limestones, 



80*. 

 Anastrophia, 41*. 

 Annelids, 26^-28*. 

 Anoplia nucleata, 51*. 



explanation of plate, 116*. 

 Anthozoa, 628-64«. 

 Atrypa reticularis, 15^. 

 Aulopora cf. schoharie, 64*. 

 Autodetus beecheri, 266, 272. 



explanation of plate, 106^. 

 Avicula communis, 34^. 



recticosta, 33^. 



subequilateralis, 31'-322. 

 Aviculopecten sp.? 34*. 



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



Jervis, 76^. 

 Becraft mountain, stratigraphic structure, 



6'-15^ 

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



Oriskany fauna in Columhia county, 6*. 



Beyrichia sp., explanation of plate, 121^. 

 Billings, E., on fauna of G-asp6 limestones, 



802. 

 Brachiopods, description of Oriskany 



species, 38''-59^; in the Helderbergian, 



85<-863, 901, 92s_936^ 944, 

 Brachyprion aratum, 57^. 



majus, 549-56«, 57^. 



explanation of plate, 118^. 



schuchertanum, 55^, 56*, 56^-57*. 

 explanation of plate, IIS^. 



varistriatum, 55^. 

 Bryozoa, description of Oriskany species, 



598-625; in the Helderbergian, 86*, Ql^, 



94'. 



Camarotoechia sp.? 41^. 



barrandii, 40*. 



dryope, 41^ 

 explanation of plate, 112'. 



(?) fltchana, 40». 



oblata, 411. 



explanation of plate, 112®. 



pliopleura, 41^. 

 Centronella, 38^. 

 Cephalopods in the Helderbergian, 84*- 



851, 927^ 939. 

 Chaetetes (Monotrypella) arbusculus, 641 



