228 



one of these is apparently identical with 0. virgatum of the 

 Niagara group of New York. 

 ( Trochoceras costatum ? 



A species of Trochoceras, resembling or identical with 

 this species of the Niagara group of Wisconsin, occurs at 

 this locality. 



Numerous species of Bryozoa and corals have been found 

 in the same association, but these have not been critically 

 compared with the known species. 



The two following species, known in the Niagaragroup 

 of Tennessee, are found at Waldron. 



ASTYLOSPONGIA PILEMOftSA. 



Among these collections there occur numerous specimens 

 of A. pwmorsa which is known in Tennessee and identified 

 by Dr. Rcemer with the European species. No other of the 

 species of Sponges described by Dr. Rcemer has been found 

 at this locality, and the specimens of this one are much 

 smaller than those in my collection from Tennessee. 



Rhynchonella tennesseensis. 



This species described by Dr. Rcemer* occurs at Wald- 

 ron in great numbers and of large size ; some of the indi- 

 viduals measure more than an inch in length and breadth. 

 In some of its varieties, it strongly resembles the R. nobilis 

 of the lower Helderberg group, but the sinus is usually 

 deeper, and the plications are more angular. 



The number of species described and enumerated in this 

 paper, amount to fifty-three, to which may be added at 

 least twelve species of Corals and Bryozoa, making al- 

 together sixty-five species, of which twenty-nine are new. 

 The extent of outcrop, from which these were obtained, 

 does not exceed a quarter of a mile. 



* Die Silnrische Fauna dcs Westlichen Tennessee. 



