of certain Birds of Cuba. 
19 
consequence of these vertebre being in birds always soldered 
together, and therefore very difficult to count. 
Number | Maximum num-| Minimum num- | Extent 
Orders. of genera; ber of sacral ber of sacral of Observations. 
examined, vertebre, vertebr2, variation. : 
1. Raprores. . Bs 12 or 2 
- Bubo. Buteo. 
2, INSESSORES . 99 13 5 
Corvus. Alcedo. 
$. RASORES . . 7 20 10 10 
Struthio, Meleagris. 
4. GRALLATORES| 14 15 7 8 
ge ie Faig, The Petrel is not taken into 
: i considerati as Cuvier 
5. NATATORES . 12 15 10 5 docs EE a eA rad 
Anas. Sterna. ber of its sacral vertebra. 
Here we see that the two Normal groups have the least number 
of sacral vertebra, and the three Aberrant the greatest. We see 
also that the number varies te mail, in B Raptores, LA most 
in the Rasores. 
The fifth and last table = I shali offer relates to the ver- 
tebræ of ne COCs > 
zd PEL LT ee 
pass : ‘Number aio nimum ne mn-j] i ? at " 
i edis. ~ [ram nuin Misi d m Saat | iida 
= examined, vertebræ. variation, 
1. RAPTORES. . 8 8 7 1 
Aquila. Aquila, Pandion 
2. INsEssoRES .| 22 9 6 3 
Hirundo. Loxia. 
3. RASORES . . 7 9 5 4 
| Struthio. Meleagris, f 
4. GnALLATORES| 5jg4-1--— = gy 12H pomi is not taken 
Ciconi consideration, because 
š — adi z. not give its 
num 0} coccy ver- 
5. NATATORES.| 13 9 i 7 2 tebre. 4E 
E nser, 
On 
