LIST OF PAPERS. 



Page 



Cobbold, T. Spencer, M.D., F.L.S. 



Description of a New Form of Naked- Eyed Medusa (Thauman- 

 tias achroa), with brief histological details 38 



Couch, Jonathan, F.L.S. &c. 



Note on the Occurrence of Pkyllosoma commune on the Coast of 

 Cornwall 146 



Forster, Thomas, M.D. 



On the Irregularity in the Return of Swallows and other Vernal 

 Migratory Birds in the Season 1857 40 



Guy, W. A., M.B. 



Note on a singular case of Colouring of the Human Hair 41 



Owen, Professor, F.R.S., V.P.L.S. &c. 



On the Characters, Principles of Division and Primary Groups of 

 the Class Mammalia 1 



Sclater, Philip Lutley, M.A., F.L.S. &c. 



On the general Geographical Distribution of the Class Aves. ... 130 

 On the Zoology of New Guinea. 149 



Smith, Frederick, Assistant in the Zoological Department in the 

 British Museum. 



Catalogue of the Hymenopterous Insects collected at Sarawak, 

 Borneo ; Mount Ophir, Malacca ; and at Singapore, by 

 A. R. Wallace 42 



Index 171 



