Head of fossil Ovis.—Fossil Chiton. 83 
marked with a very plain suture. Margin, smooth. The dermoid 
portion is replaced by a beautiful, greenish colored, crystalized car- 
bonate of lime, about one line thick. 
Remarks.—This beautifully preserved fossil animal, was found a 
few days since, imbedded in a dark carbonaceous lime rock, which 
forms the bed of the Muskingum river, a short distance below the 
falls. In splitting the rock, the back of the animal was distinctly 
i ; the abdomen is yet buried in the fragment. — The outlines 
are very perfect, showing the back and sides very distinctly. . This 
