PREFACE, 



bird-forms of an extraordinary character in the ter- 

 tiaries of the Argentine Republic, which appear to 

 belong to a new group of Ratitse. As has been 

 already suggested (see our remarks on this subject, 

 p. 474), we again venture to express a hope that it 

 may be found possible to obtain the judgment of 

 an experienced Palaeontologist upon these specimens. 

 If a competent person could be induced to proceed 

 to Buenos Ayres with this object, we might expect 

 him to arrive at results of very great interest to 

 Ornithology. 



P. L. S. 



3 Hanover Square, London, W. 

 Sept. 1st, 1892. 



