INDEX 



127 



Pteropods, description of Oriskany species, 



2S 4 ; in the Helderbergian, 85 1 , 94 1 . 

 Pterygoinetopus eboraceus, IS 4 . 

 (?) Ptyckonema helderbergiae, G3 1 . 



Rafinesquina alternata, 55 4 . 

 Rensselaeria ovalis, 40 1 . 



ovoides, 39 8 . 

 explanation of plate, 112 7 . 



suessana? 40 1 . 

 Reteporina, 61 1 . 

 Rhipidornella oblata, 58 2 . 



explanation of plate, 118 s . 

 Rhombipora rhombifera, 59 9 . 

 Rhynchonella barrandii, 40 7 . 



dryope, 41 3 . 

 Ries, Heinrich, report on geology of 



Orange county, 75 6 . 

 Ruedemann, Rudolf, observations on 



Kingston beds, 73 4 . 



Schoharie county, Oriskany fauna, 77 3 . 

 Schuchert, Charles, on age of Helder- 

 bergian, 83 5 . 

 Spirifer antarcticus, 47 s . 



arenosus, 46 3 . 



arrectus, 46 s . 

 var. antarcticus, 47 9 -48 1 . 



capensis v. Buch, 4S 2 . 



chuquisaca, 48 1 . 



cf. firabriatus, 48 4 . 



gaspensis, 50 5 . 



hawkinsi, 4S 2 . 



murchisoni, 46 7 -48 3 . 



explanation of plate, 115 s . 



orbignyi, 48 1 . 



pprforatus, 43 4 . 



Spirifer pyxidatus, 48 T . 

 raricosta, 14 6 . 

 saffordi, 48 3 . 



explanation of plate, 115 1 . 

 varicosus, 15 1 . 



Spirorbis assimilis, 26 9 -27 2 . 

 explanation of plate, 107 1 . 



Spongiae in the Helderbergian, 92 5 , 95 5 . 



Stictopora sp.? 60 1 . 

 granulata, 60 2 . 



Stratigraphic structure of Becraft moun- 

 tain, 6 7 -15 3 . 



Streptorhynchus pandora, 15 1 . 



Stromatopora, 15 2 . 



Stromatoporoids in the Helderbergian, 

 95 5 . 



Stropheodonta, 54 9 . 



demissa, 57 6 . 



lincklaeni, 52 8 -53 3 . 

 explanation of plate, 117 7 . 



cf. radiata, 56 9 . 



varistriata, 55 1 . 

 var. arata, 55 3 . 

 Strophodonta lincklaeni, 52 s . 



magnifica, 53 4 . 

 Strophomena rugosa, var. ventricosa, 57 s . 

 Strophostylus expansus, 30 6 . 



explanation of plate, 109 2 . 

 Synphoria stemmatus, 15 5 -19 2 . 



Tentaculite limestone, 98 5 . 

 Tentaculites ? acus, 28 1 . 



explanation of plate, 10S 1 . 

 elongatus, 27 6 , 28 1 . 



explanation of plate, 108 4 . 

 cf. elongatus, 27 7 . 



