no. L762. 



A NEW FOSSIL CROCODILE— GILMORE. 



495 



corresponding perhaps to the eighth in recent crocodiles, shows the 

 same step-like facets with which the tubercula of the ribs articulate. 

 AsLambe has pointed out, the anterior zygapophyses together with 

 the bases of the transverse processes form an undulating pint form of 

 considerable extent. The more nearly horizontal position of these 

 zygapophyses would appear to distinguish the vertebrae from t hose of 

 L. auuuU nsis. 



/ 



Fig. 1.— Leidvosuchus sternbergii. a, fourth (?) lumbar vertebra, seen from right side; 

 6, second sacral vertebra, seen from front. Both figures natural size. 



Measurements of dorsal vertebrx of Leidyosuchus sternbergii. 



< treatesl length of centra 



Greatest transverse diameter, anterior end 



Greatest vertical diameter, anterior end 



Greatest transverse diameter, posterior end 



Greatest vertical diameter, posterior end 



Greatest antero-posterior extent of left transverse. . 

 Greatest, length of left transverse from median line. 



The two lumbar vertebrae are probably the third and fourth of the 

 series. Their centra differ from the dorsals in being more broadly 

 rounded inferiorly and having their least transverse diameter nearer 

 the middle. The neural canal is more nearly circular, and the 

 transverse processes are narrower and spring from the sides of the 

 arch at a lower level than in the dorsals, thus leaving the anterior 

 zygapophyses standing out alone and well above them. The spinous 

 processes rise above the middle of the centrum as a broad, thin plate 

 with a truncated upper extremity (see a, fig. l). 



