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end was taken, is in the fine cabinet of Mr. William 

 Hyde, who permitted me to use it with his wonted 

 liberality and kindness. It is said to have been found 

 in Northumberland, Pennsylvania, and occurs in grey 

 carbonate of lime. In the Philadelphia Museum, 

 there is a fine fragment of this species, in which there 

 is embedded some crystals of iron pyrites; it was ob- 

 tained in Ulster County, New York. In the cabinet 

 of the Academy of Natural Sciences, there is a longi- 

 tudinal and hollow fragment, filled with ochre, and 

 the oxide of iron; it is labelled from Lockport, New 

 York. At Mount Hope Institution, near Baltimore, 

 there is also a good specimen from the same locality. 

 In the Clinton collection, owned by the Albany Insti- 

 tute, there is a large extended fragment, nearly five 

 inches long. It is embedded in brown limestone, 

 and was found in Madison County, N. Y. There are 

 twelve articulations of the abdomen remaining, and 

 the epidermal covering of the tail is distinctly marked 

 with numerous dots. In the same collection there is 

 another large fragment of this species, consisting of 

 the tail and fourteen articulations, It was found in 

 Steuben County, New York; and occurs in grey 

 limestone. It is slightly contracted and very much 

 depressed laterally. There js also a head in the same 

 kind of limestone, from Cazenovia, Madison County, 

 New York. In the cabinet of the Institute there is 

 another specimen of this species, about six inches 

 in length, and nearly perfect; it is also embedded in a 

 similar rock, and was brought from Rochester, Mun- 

 roe County, New York. 



