Vlll CONTKNTS. 



Main, James. 



Remarks on the Variation in the Plumage of Birds - - 167 



On the possible Origin of the Ignis Fatuus - - -548 



On the Habits of the Boat Fly - - - -558 



Gray, George Robert, M.E.S., &c. 



Description of some singularly formed Orthopterous Insects - 141 

 Description of a new Subgenus, and some Remarks on Birds be- 

 longing to the Family Laniadae - - - - 487 



Gray, John Edward, F.R.S., &c. 



On the Enlargement of the Eggs of some Marine Molluscans 

 during the Period of their Hatching - 247 



A Synoptical Catalogue of the Species of certain Tribes or 

 Genera of Shells contained in the Collection of the British Museum 

 and the Author's Cabinet; with Descriptions of the New Species - 370 

 On a new Genus of Land Shells - - - - 484 



Description of some new, or little known, Mammalia, principally 

 in the British Museum Collection - - - - - 577 



Green, H. 



Notice respecting the Transformation of Campontia cruciformis - 279 

 Manby, George W., Capt. F.R.S. 



Notice of a remarkable Fact in the Habits of the Viper - 382 



Mantell, Gideon, LL.D., F.R.S., &c. 



Communication upon Fossil Saurians - - - - 341 



Martin, William, F.L.S. 



Observations upon the Swimming of Snakes - 383 



Mitchell, James, LL.D., F.G.S., &c. 



On the Strata near Swanwich, in the Isle of Purbeck - - 587 



Moore, Edward, M.D., F.L.S. 



Description of a new British Fish (Peristedion Malarmat Lacep. 

 and Cuv.) - - - - - - 1 7 



On the Raptorial Birds of Devonshire - - - - 1 1 5 



On the Passerine Birds of Devonshire - - - - 176 



Climbing and Gallinaceous Birds of Devonshire - - 227 



On the Wading Birds of Devonshire - - - 319 



On the Web-footed Birds of Devonshire - - 360 



On the change of Plumage in the Guillemot - 607 



Mumby, G. 



Sketch of the Botany, &c, of the Neighbourhood of Hyeres - 1 92 

 Ogilby, William, M.A., F.L.S., &c. 



Observations on the opposable Power of the Thumb in certain 

 Mammals, considered as a zoological Character; and on the na- 

 tural Affinities which subsist between the Bimana, Quadriimana, 

 and Pedimana - - 449. 517 



Owen, Richard, F.R.S., &c. 



Description of the Membranes of the Uterine Fcetus of the 

 Kangaroo - - - - - - - -481 



Peacock, J. B. 



Remarks on some of the Marine Animals met with during a 

 Sea Voyage. - - - - - - - - 596 



Read, R. W. H., F.Z.S. 



Notice of a Woodcock shot in July - - - - 52 



Richardson, G. F. 



Translation of a Memoir on Fossil Saurians - - -341 



Richardson, William, M A., F.G.S. 



Observations upon the chronological Arrangement of fossili- 

 ferous Deposits, by a Reference to their organic Contents - - 122 



Salmon, S. D. 



Record of a new Species of Tringa Shot near Yarmouth - 54 



Remark on the Migration of Swifts - - - - 108 



