226 



THe following species known in the Niagara group of 

 New York, have been recognized in the Waldron locality : 



CMNOIDEA. 



EUCALYPTOCR1NUS CCELATUS. 



This is the only crinoid identified with any species known 

 in the same group in New York. While Caryocrinus is 

 abundant in New York, and common in Wisconsin, Iowa 

 and Kentucky, and abundant in Tennessee, not a frag- 

 ment of it has been found in the Indiana locality ; nor has 

 a fragment of any Cystidean been observed. 



BRACHIOPODA. 



Orthis elegantula, larger than the New York specimens. 

 Orthis hybrida. 



Streptorhynchus (Strophomena) subplana. 

 Strophomena rugosa, S. rhomboidalis. 

 S. striata. 



Spirifer radiata, remarkably fine specimens. 

 Sp. crispus. 



Meristella nitida, larger than the New York specimens. 

 Nucleospira pisiformis. 

 Atrypa reticularis. 

 Rhynchonella cuneata. 

 R. neglecta. 



The Streptorhynchus subplanus {Strophomena subplana, Con- 

 rad, Hall, Leptczna subplana, Hall, Pal. N. Y., vol. II, p. 259. 

 occurs in the rocks at Waldron in considerable numbers, 

 and among them are separated dorsal and ventral valves, 

 which possess the characters of Streptorhynchus as shown 

 in the symmetrical forms of that genus in the Silurian rocks 

 as well as in some of the Devonian species. 



The genus Streptorhynchus, of King, which has not been 

 until lately fully recognized. in our rocks, appears to me to 

 exist in three distinct types, or modifications of type, 



