682 THE BEIDGER FAUNA. 



rior and posterior basal cingula. There is no tubercle between the inner 

 bases of the transverse ci'ests of this or the last true molar. The latter is 

 characterized by the rudimental character of the posterior external crescent 

 crest, which is shortened like that of Hyrachyus. The transverse crests are 

 curved backwards; the posterior is short and simple. 



The canines are small, and are directed forwards. The extremity of 

 the muzzle being broken, the relation of the incisors cannot be stated, but 

 there was not probably any precanine diastema. An incisor preserved has 

 the crown transversely expanded, and rather oblique. 



The third and fourth inferior premolars are the deciduous ones, and 

 are both three-lobed, but differ in the forms of the anterior lobe. In the 

 third, it is narrow and incurved, as in the corresponding permanent teeth of 

 some Artiodactyla. The transverse crests of the true molars are rather 

 oblique, running forwards as well as outwards. 



Their external extremities are bent at right angles, and there results a 

 short descending crest running forwards and inwards; the anterior one 

 turns inwards again, forming a transverse anterior ledge. No cingula on 

 internal or external b4ses of crown; a rudimental posterior one. 



Measurements of cranium. 



Length from front of canine tooth to end of occipital condyles 128 



Length from same to postglenoid process .096 



Length from same to end of last molar 069 



Length from same to first premolar 015 



Length from same to line of front of orbit 044 



Width between superciliary borders 046 



Width of zygomata at orbits '. 064 



Width of brain-case at glenoid surface 048 



Width of occipital condyles 023 



Width of basiocoipital bone between ossa petrosa 006 



Distance between postglenoid and post-tympanic processes 014 



Depth of occiput behind 033 



Depth of mandible from condyle 040 



Depth of mandibular ramus at third premolar 014 



Depth at diastema (axial) 009 



Least width of symphysis Oil 



Diameter crown third permanent premolar ^ anteroposterior 007 



(transverse .005 



Anteroposterior diameter cro wu first premolar 0045 



Diameters crown first true molar 1''^"'^™!"'^*''"°"' ^^" 



c transverse 012 



Diameters crown second inferior true molar \ anteroposterior Oil 



( transverse 0075 



Diameter of root of inferior canine near crown 0035 



