Contents (^continued). 



Description of a New Species of Entozoon, from the intestines 



of the Elephant. By W. Batrd, M.D 425 



Descriptions of New Shells in the Collection of H. Cuming. 



By G. B. SowERBY, F.L.S 428 



Descriptions of New Univalve Shells from the Collections of H. 



Cuming and S. Hanley. By Sylvanus Hanley 429 



Exhibition of three specimens of Hybrid Ducks, obtained on the 

 south shore of Long Island, by Daniel G. Elliot, Esq., 

 of New York 437 



Exhibition of curiously plumaged Pheasants, by Dr. Hamilton, 



F.Z.S 437 



Description of Macandreioia and Myliusia, two new forms of 



Sponges. By Dr. J. E. Gray, V.P.Z.S 437 



On some new or little-known Birds from the Rio Napo. By 



Philip Lutley Sclater, M.A., Secretary 440 



On some Hybrid Ducks bred in the Society's Gardens. By 



Philip Lutley Sclater, M.A., Secretary 442 



LisC of Malayan Birds collected by Dr. Cantor, with Descrip- 

 tions of imperfectly-known Species. By Frederic Moore 443 



Remarks on the Habits of a Herring Gull (Larus argentatus). 



By A. D. Bartlett 467 



On the most efficient Means of preserving the Eggs of Birds 

 in order that they may be afterwards hatched. By A. D. 

 Bartlett 468 



On the Reptiles and Fishes collected by the Rev. H. B. Tris- 

 tram in Northern Africa. By Dr. A. Gunther 469 



Notes on the Reptiles and Fishes of the Sahara. By Rev. PI. 



B. Tristram, F.L.S 475 



Description of a New Species of Squirrel (Sciurus siamensis) 

 from Siam, in the Collection of the British Museum. By 

 Dr. J. E. Gray, V.P.Z.S 478 



Description of a New Species of Freshwater Tortoise from Siam. 



By Dr. J. E. Gray, V.T.Z.S 478 



Description of some New Genera of Lithophytes, or Stony Zoo- 

 phytes. By Dr, J. E. Gray, V.P.Z.S 479 



Description of a new Conchiferous Mollusk of the genus Pan- 

 dora. By Arthur Adams, R.N. 487 



Systematic List of the species of JDolium, restricted. By Syl- 

 vanus Hanley 487 



On Two New Species of Cinclus. By John Gould, V.P.Z.S. 493 



Exhibition of specimens of Corystes cassivelaunus, and the 



young of Comatula rosea, by T. H. Stewart 494 



Index ..., . 495 



