Page 



Knox, R., Esq., M.D., F.R.S.E. 



Contributions to the Anatomy and Natural History of the Cetacea. 63 



Smith, Frederick, Esq., Assistant in the Zoological Department in 

 the British Museum. 



Catalogue of Hyraenopterous Insects collected at Celebes by 



Mr. A. R. Wallace 4 



Catalogue of Hymenopterous Insects collected by Mr. A. R. 

 Wallace at the Islands of Aru and Key 132 



Walker, Francis, Esq., F.L.S. 



Catalogue of the Dipterous Insects collected in the Aru Islands 



by Mr. A. R. Wallace, with Descriptions of New Species 71 



Catalogue of the Heterocerous Lepidoptera collected at Singapore 



by Mr. A. R. Wallace, with Descriptions of New Species 183 



Catalogue of the Heterocerous Lepidopterous Insects collected 

 at Malacca by Mr. A. R. Wallace, with Descriptions of New 



Species 196 



Wallace, Alfred R., Esq., and Darwin, Charles, Esq., F.R.S., 

 F.L.S., & F.G.S. 



On the Tendency of Species to form Varieties; and on the 

 Perpetuation of Varieties and Species by Natural Means of 

 Selection 45 



Washington, Captain. 



Natural-History Extracts from the Journal of Captain Denham, 



H.M. Surveying Vessel * Herald,' 1857 32 



Wetherell, John W., Esq. 



Notice of the occurrence of recent Worm Tracks in the Upper 

 Part of the London Clay Formation near Highgate 31 



Index 199 



