of certain Birds of Cuba. 



19 



consequence of these vertebrae being in birds always soldered 

 together, and therefore very difficult to count. 



Here we see that the two Normal groups have the least number 

 of sacral vertebrae, and the three Aberrant the greatest. We see 

 also that the number varies the least in the Raptores, and most 

 in the Rasores. 



The fifth and last table that I shall offer relates to the ver- 

 tebrae of the coccy'x. 



D 2 



On 



