1884.] Prof. Owen. On a Large Extinct Lizard. 221 



„.=<,. Ml-l), =ft ,*u(*.y), 



where + « and ?/ is arbitrary. But in order that these values 



may satisfy the equations, a relation among the parameters of the 

 Theta-f unctions must be satisfied. This is 



C 6 C 10 C 5 C 9 + C l C 13 C 2 C lt = ^* 



The solution is not complete, because after satisfying the equations 

 of motion only four constants remain to express the initial conditions, 

 whereas six constants are required., 



IV. "Evidence of a Large Extinct Lizard (Notiosaurus den- 

 tatus, Ow.) from Pleistocene Deposits, New South Wales, 

 Australia." By Professor Owen, C.B., F.R.S. Received 

 January 9, 1884. 



(Abstract.) 



In this paper the author describes a fragment of jaw with teeth of 

 a fossil from the pleistocene deposits at the " Cuddie Springs," New 

 South Wales, transmitted by E. S. Wilkinson, Esq., of the Depart- 

 ment of Mines, Sydney. 



A series of comparisons are detailed with known recent and fossil 

 Saurians, and the microscopic test is applied to the tissues of the bone 

 and tooth. 



The conclusion arrived at is that the fossil was part of a lacertian 

 reptile, equal in size to the Megalania, but of carnivorous habits ; 

 distinct from the largest existing toothed and pleurodont lizard 

 (Hydrosaurus giganteus.) For the much larger extinct pleurodont 

 Saurian the author proposes the name Notiosaurus dentatus. 



