IV PRKFACE. 



Ill tlic'se works, however, there is great divergence as to the 

 classification and nomenclature of the specimens, Dr. Gray, especi- 

 ally after he had commenced to study the configuration of the 

 skulls, having introduced at successive periods numerous changes 

 which cannot be maintained in the present state of our knowledge. 

 Also the 'Hand-List ' of 1873 has become antiquated, not only on 

 account of the additions of more recent years, but also in consequence 

 of the elimination of numerous duxjlicates which were transferred to 

 other public Museums. 



Thus it appeared desirable to prepare another issue of this 

 * Catalogue ' on the plan of the new series of descriptive Catalogues 

 of the Zoological Collections. Numerous woodcuts have been 

 introduced, chiefly with the object of illustrating the principles 

 adopted in the classification ; all are taken from specimens in the 

 Museum, but many have already appeared in Dr. Gray's papers in 

 the 'Proceedings of the Zoological Society,' and are reproduced 

 here by the kind permission of the Council of that Society. 



ALBERT GUNTHER, 



Keeper of the Depart imnt of Zoolojy, 

 British Museum (X. H.), 

 January 13, 1889. 



