79 



back to the anterior border. The lateral lobes are somewhat 

 reniform, wider than the central lobe, but much shorter. The 

 anterior border of the head is in the form of a very small 

 rounded rim, depressed at the lines dividing the glabella into 

 three lobes. There is a rather deep, transverse sulcus at the 

 posterior part of the three lobes of the glabella, behind which, 

 posterior to the central lobe, there is a flattened or slightly 

 concave area in front of the neck furrow and behind the lateral 

 lobes of the glabella, there is a transverse elevation produced 

 into a conical elevation, laterally, beyond the lateral lobes and 

 which extends to the visual organs. Movable cheeks not pre- 

 served. 



Found in the Niagara Group a few miles back of Madison, 

 Indiana, and now in the collection of S. A. Miller. The specific 

 name is in remembrance of the late distinguished naturalist, 

 Dr. R. M. Byrnes. 



