Observations on Trilobites* 18& 



State of New-York. In the cabinet of Major Delafield, is a 

 Calymene, from Paterson, N. J. of a species that has not 

 hitherto been described; and in the collection of the Lyceum 

 is another, probably also new, and brought by Mr. Cooper 

 from Leroy, in our State. 



Species of the Asaphus are to be met with at Gle ns Falls 

 on the Hudson River, at Kingston on the Wallkill, on the 

 Banks of Lake Cayuga, and of the Seneca Lake, on the 

 south shore of Lake Erie near Sandusky, on the Kaatskill 

 Mountains, and at Greenville Falls on the Ottowa river in 

 Upper Canada. The five last localities are furnished us by 

 Major Delafield, who has good specimens from the several 

 places. 



Specimens of the genus Ogygia, are said by Brongniart 

 to have been brought from the Genesee river, and from the 

 Banks of the Mohawk river near Schenectady. 



Besides the Trenton locality of the Isotelus, we have seen 

 in the cabinet of Major Delafield, a portion of limestone 

 nearly similar in appearance, and containing numerous im- 

 pressions of the tails of animals of the first species of that 

 genus; at was found at Canajoharie. 



In the British Geological Transactions for the year 1S23, 

 a new Trilobite is described by Dr. Bigsby, to whom the 

 geology of our country is under so many obligations. Not 

 having that work before us, we are unable to say to which of 

 the genera of Brongniart it belongs, or whether like the 

 Isoletus, it may not be considered as the type of a new genus. 



It thus appears that the genera and species of this interest- 

 ing family are numerous in our country. Opportunities will 

 therefore not be wanting to future inquiries to examine more 

 particularly its relations with the organized beings at present 

 existing. Could any positive light be thrown upon their 

 habits and mode of life, it would probably add much to our 

 knowledge of the previous state of the earth, and thus extend 

 the boundaries of geological science. 



