Cyclopidius (Pithecistes) Cope, etc. 407 



Measurements. 



(Cat. No. 10121, Y. P. M., unless otherwise indicated.) 



mm. 



Skull, length, occip. condyle to canine inc., approx 107 



Bizygomatic diam., approx 74 



Diam. of postorbital constriction 20.5 



Max. width of brain-case • 34.5 



"Width above P^ 27 



Width between middle of orbits 38 



Ant.-post. diam. of facial vacuity, approx 30 



Ant.-post. diam. of bulla (Cat. No. 10120) 21 



• Transverse diam. of bulla (Cat. No. 10120) 18.5 



Depth of malar below middle of orbit 14 



Depth of paramastoids below inferior border of audi- 

 tory meatus 26 



Ramus, depth, coronoid to angle 55 



Depth below M, , 18 



Total length, approx 90 



Superior molar series, length 28.5 



Superior premolar series, length (Cat. No. 10120) 17-20 



Inferior molar series, length (Cat. No. 12668) 32 



Inferior premolar series, with P^, length (Cat. No. 12668) 20.5 



Leptauchenia cf. decora Leidy. 



A skull with jaws attached, not readily identifiable with 

 any of the three described species of this genns, was 

 collected in 1914 by John T. Doneghy, Jr., at Rattlesnake 

 Butte, about 6 miles southwest of Chadron, Nebraska. 

 This skull is that of an immature individual, in which 

 neither superior nor inferior third molar is erupted. It 

 was found in the Lower Miocene beds, and I believe 

 represents a form intermediate in size between L. decora 

 and L. major. 



This specimen. Cat. No. 12221, Y. P. M., is exceedingly 

 well preserved, with the exception of the superior part 

 of the muzzle in advance of the orbits, including the 

 superior incisor border. The chief characters may be set 

 forth briefly. The total length of the skull is approxi- 

 mately that of L. decora, but in the fully adult form it 

 must have been somewhat longer. The sagittal crest 

 is short and has a nearly straight contour. From the 

 junction of the temporal ridges, the upper contour 

 descends steeply to the tip of the nasals, giving an anthro- 

 poid appearance from a lateral view. The orbits are 

 small and look chiefly upward and outward, in which 



