G. T. BETTANY ON THE GENUS MERYCOCHCEBUS. 273 



EXPLANATION OF THE PLATES. 



Plate XVII. 



Merycochoerits temporalis, half natural size. All the views are from the 

 same specimen. 



Fig. 1. Upper view of skull. 



2. Skull seen from behind. 



3. View of right side ; orbital region partly restored from the 



left side. 



4. Posterior basicranial region. 



(au.b, auditory bulla; po, paroccipital process ; p.gl, postglenoid process.) 



Plate XVIII. 



Merycochcerns Leidyi, two thirds natural size. 



Fig. 1. Right side of skull, somewhat completed from the left side. 

 2. Front view of face of same specimen. 



(oc.c, occipital condyle; po, paroccipital process .; pgl, postglenoid process.) 



Discussion. 



Prof. Duncan remarked that these late American forms seem to 

 be very variable. Notwithstanding its name, the affinities of this 

 genus to the Pigs was but small. The teeth appeared to be very- 

 variable ; and this tendency to variation would seem to indicate a 

 near passing- away of this type. 



