34 Bulletin 6 34 



part of the Ithaca group. The original specimens came from 

 the bottom of the gorge below Triphammer falls. 



Poteriocrinus cornellianics H. S. W. 



Reported by H. S. Williams from the Ithaca group. 



Poteriocrinus clarkei var. alpha H. S. W. 

 Lower Ithaca group. — H. S. Williams. 



Poteriocrinus {Decadocrinus) gregariiis H. S. W. 

 Ithaca group. — H. S. Williams. 



Poteriocrinus {Decadocriyius) zethus H. S. W. 

 Portage group? — H. S. Williams. 



Taxocrinus ithacensis var. alpha H. S. W. 

 Ithaca group. — H. S. Williams. 



Taxocrinus curtus H. S. W. 

 Portage group. — H. S. Williams. 



MoUuscoidea and Mollusca. 



Brachiopoda. 



Discina neglecta Hall. 

 Upper Ithaca group. 



Discina grandisf Hall. 



Specimens which appear to belong to this species occur in the 

 Ithaca group. 



Lingula complanata H. S. W. 

 Abundant in the Ithaca shale. 



Lingula punctata Hall. 

 Ithaca shale. 



Lingula spatulata Hall. 

 Ithaca shale. 



Lingula ligea Hall. 

 Ithaca shale. 



Crania sp. 



A species of Crania resembling C. hamittonia occurs through 

 the Portage and Ithaca rocks. 



