Fossil Reptiles of New-Jersey. 141 



stance is homogeneous, black, and it effervesces freely with 

 acids. A small cavity on one side, where was probably undi- 

 gested matter, is now by a few experiments ascertained to con- 

 tain carbonate and phosphate of lime, with minute siliceous 

 pebbles. Professor Torrey proposes to furnish the Lyceum 

 with a complete analysis of this very remarkable substance. 



