CONTENTS. V 



PAGE 



Skinner, Henry. Mimicry in butterflies (abstract)* 141 



Smith, Burnett. Observations on the structure of some coral 



beds in the Hamilton Shale (Plates X, XI) 446 



Stone, Witmer. Fauna and flora of the New Jersey Pine 



Barrens (abstract) 149 



A new Synallaxis 365 



Thompson, Will F. The protoconch of Acmsea. ... 540 



Trotter, Spencer. The faunal divisions of eastern North 



America (abstract) * 142 



True, Frederick W. A new species of Delphinodon (ab- 

 stract)* 155 



Vanatta, E. G. Phenacolepas malonei, n. sp 151 



A new species of Vertigo from Florida 445 



Wherry, Edgar T. The Triassic of Pennsylvania 156 



Apparent sun-crack structures and ringing-rock phenomena 

 in the Triassic Diabase of Eastern Pennsylvania (Plate 



II) , 169 



Silicified wood from the Triassic of Pennsylvania (Plates 



III, IV) 366 



Age and correlation of the "New Red" or Newark group 

 in Pennsylvania 373 



* These papers are published in full in the Commemorative volume of the 

 Academy's Journal (XV). 



