Vll 
Van der Hoeven, J., Esq. page 
Contributions to the knowledge of the Animal of Nautilus 
Pompilius . 1 
Wallace, A. R., Esq. 
On the Umbrella Bird (Cephalopterus ornatus ); commu¬ 
nicated by Mr. S. Stevens.206 
Westwood, J. O., Esq., F.L.S. &c. 
Observations on the destructive species of Dipterous In¬ 
sects known in Africa under the names of the Tsetse, Zimb, 
and Tsaltsalya, and on their supposed connection with the 
fourth plague of Egypt.258 
White, Adam, Esq., F.L.S. &c. 
Descriptions of some apparently New Species of Longi - 
corn Coleoptera , in the Collection of the British Museum . 10 
Descriptions of two Species of Crustacea in the British 
Museum. 95 
