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(giganteus and didiformis) to which they were referred. ‘These data 
showed that the trifid foot-print of the Dinornis giganteus must have 
exceeded in size the Ornithichnites giganteus and O. ingens of Prof. 
Hitchcock, and that the Din. didiformis must have left impressions 
as large as those called Ornithichnites tuberosus. 'The author warned 
his hearers against inferring identity of species or even genus between 
the extinct Struthionide of the alluvium of New Zealand and those 
of the trias of North America, on account of correspondence of size 
and number of toes, which the modern genera Casuarius, Rhea, &c. 
proved to be insufficient grounds. He concluded by a comparative 
review of recent and extinct Struthionide, remarking on their peculiar 
geographical distribution, on the conditions which favoured the for- 
mer existence of so rich a development of the family in New Zealand, 
and on the probable causes of their extermination. Evidence of the 
recent character of the bones described was afforded by the great 
proportion of animal matter which they retained, and the details of 
the analysis of the earthy salts were promised for a future Meeting. 
