CONTENTS. 



LIST OF CONTRIBUTORS, 



With references to the subjects of their respective communications. 



Agassiz, Louis, (Professor.) 



Letter addressed to the Editor, on the subject of the French 

 Edition of Sowerby's Mineral Conchology of Great Britain - 356 

 Alexander, Henry, F.G.S. &c. 



On the discovery of the teeth of the Mastodon, in the Crag - 466 

 Alexander, Sir James 



Letter in reply to the Review of his African Expedition of Dis- 

 covery. -.-__.._ 512 

 Anning, Mary. 



Note on the supposed frontal spine in the genus Hybodus. - 605 

 Bachman, J., D.D. &c. 



Monograph of the species of the Genus Sciurus, inhabiting 

 North America, with Descriptions of New Species and their 

 Varieties - - - -113,154,220,330,378 



Baker, George. 



Extract from a Letter addressed to the Editor, relating to the 

 death of Dr. William Smith - - - -515 



Bartlett, A. D. 



Note relating to some Goshawks in the possession of the late 



Mr. Hoy 602 



Bean, William. 



Catalogue of Fossils found in the Cornbrash Limestone of Scar- 

 borough ; with figures and descriptions of new species - 57 

 Bedford, William. 



An Account of the Strata of Lincoln, from a recent Survey, 

 commencing North of the Cathedral, and descending to the 

 bed of the River ------ 553 



Bird, F. J. 



On the artificial arrangement of some of the more extensive 

 Natural Orders of British Plants - - - - 181 



Bird, Golding, M.D., F.L.S., &c. 



On the application of Heliographic or Photogenic Drawing to 

 Botanical Purposes ; with an economical mode of preparing 

 the Paper - - - - - - 188 



Bladon, James. 



On the derivation of the name Adder, as applied to the Viper 566 

 On the mode of projection of the eggs in the Crane-fly - 566 



