TO 



JOHN EDWARD GRAY, F.R.S., 



T.P.Z.S., P.l.S., ETC. ETC. ETC., 

 AND TO HIS WIFE 



MARIA EMMA GRAY, 



THIS LITTLE WOKK IS AFFECTIONATELY INSCEIBED 

 BY THEIE GRATEFUL NEPHEW 



S. 0. GEAT. 



