INDEX 



127 



Pteropods, description of Oriskany species, 



28^; in the Helderbergian, So^, MK 

 Pterygometopus eboraceus, 18^ 

 (?) Ptychonema helderbergiae, C3i. 



Rafinesquina alternata, 55^. 

 Rensselaeria oralis, 40^. 



ovoides, 39^. 

 explanation of plate, 112'. 



suessana? 40^. 

 Retepbrina, 61^ 

 Rhipidomella oblata, 58^. 



explanation of plate, 118*. 

 . Rhombipora rhombifera, 59'. 

 Rhjnchonella barrandii, 40'. 



dryope, 41^. 

 Ries, Heinrich, report on geology of 



Orange county, 75^ 

 Ruedemann, Rudolf, observations on 



Kingston beds, 73*. 



Schoharie county, Oriskany fauna, 77^. 

 Schuchert, Charles, on age of Helder- 

 bergian, 83^ 

 Spirifer antarcticus, 47*. 



arenosus, 46*. 



arrectus, 46*. 

 var. antarcticus, 47®-48^ 



capensis v. Buch, 48?. 



chuquisaea, 48^. 



cf. fimbriatus, 48*. 



gaspensis, 50^. 



hawkinsi, 48^. 



murchisoni, 46'-48'. 

 explanation of plate, US'. 



orbignyi, 48^ 



P^rforatus, 43*. 



Spirifer pyxidatus, 48'. 

 raricosta, 14^. 

 saffordi, 481 



explanation of plate, 115^. 



varicosus, 151. 

 :Spirorbis assimilis, 26^-272. 



explanation of plate, 107^. 

 Spongiae in the Helderbergian, 92=, 95^. 

 Stictopora sp.? 60^. 



granulata, 60^. 



Stratigraphic structure of Becraft moun- 

 tain, 6M53. 

 Streptorhynchus pandora, 15^. 

 Stromatopora, 15^. 



Stromatoporoids in the Helderbergian, 

 955. 



Stropheodonta, 54*. 



demissa, 57^ 



liucklaeni, 528-53*. 

 explanation of plate, 117''. 



cf. radiata, 56^ 



varistriata, 55^ 

 var. arata, 55*. 

 Strophodonta lincklaeni, 52». 



magnifica, 53*. 

 Strophomena rugosa, var. ventricosa, 57*. 

 Strophostylus expansus, 30^. 



explanation of plate, 109^. 

 Synphoria stemmatus, 15^-19*. 



Tentaculite limestone, 98^ 

 Tentaculites ? acus, 28^. 



explanation of plate, 108^. 

 elongatus, 27«, 28i. 



explanation of plate, 108*. 

 cf. elongatus, 27'. 



