No. 50.] 65 



Prof. Hall, in the first volume of the Palseontology, remarks 

 that 



" This rare fossil was obtained by Dr. Emmons from a boulder near Hogans- 

 burgh (N.Y.); but from other associated fossils, it clearly belongs to the 

 Trenton limestone. The original of the perfect specimen has been lost, and our 

 description is taken from a plaster cast." 



No. 2. CALYMENE SENARIA (Conrad). 



Emmons, GeoL New-York, pa. 390. 

 Hall, PaL New-York, VoL i, p. 238. 



The following are Prof. Emmons's remarks on this fossil, on page 

 390 of his Geology of New- York : 



No. 2. The Calymene senaria is one of the most abundant fossils in this rock 

 (Trenton limestone). In the Second District it is found at Glen's-Falls, Essex 

 and Plattsburgh; and it is also found at Cumberland Head, on the opposite 

 shore in Vermont, where the slaty limestone of the trenton rock is found. 



No. 3. ILL^NUS TRENTONENSIS. Emmons, Geol. Rep. N.York, p. 390. 

 ILL^NUS CRASSICAUDA. Hall, Pal. New-York, Vol. 1, p. 229. 



Prof. Emmons's description of this fossil, on page 390 of his 

 Geology, is as follows : 



No. 3. For this small trilobite, I am indebted to my friend Dr. Crawe of 

 Watertown. It seems to be rather rare, though it has been found in the valley of 

 the Mohawk. The specimen from which the drawing was taken was found at 

 Watertown. 



Senate No. 50.] 



