288 



Figure 5. Ring of the Herring Gull, considerably larger than 

 in the Wild Goose, though the bird is but little 

 more than a third its size and weight. 



6. Ring of the Gannet. 



6a. Two detached bones of the same. 



65. A section of one of the bones to shew its thickness ; 

 in this bird the bones are thicker, more compact, 

 and stronger than in an any other known instance. 



7. Ring of the Pelican, a much larger bird than the 



preceding. 



8. Ring of the Black-throated Diver, which is large 



and strong. 

 8a. Detached bones of the same. 



9. Ring of the Red-throated Diver, which though a 



larger bird than the preceding, has the ring more 

 feeble and smaller ; indicating that it takes its 

 food nearer the surface of the water. 

 9a. Detached bones of the same. 



10. Ring of the Sea Parrot ; which covers a larger por- 



tion of the eye than in any other aquatic bird ; 

 and acquires greatly increased strength from the 

 extent to which the bones overlap each other. 

 10a. Detached bones of the same. 



11. Ring of the Domestic Fowl. 



12. Ring of the Collared Dove, which like all the other 



Columbidse which have come under the author's 

 notice, consists of 11 bony plates ; the smallest 

 number met with in any class of birds ; the 

 extinct Dodo being the only bird with the like 

 number. 



13. Ring of the Wood Grouse. 



14. Ring of the Green Woodpecker, which is larger 



and covers a much greater portion of the eye, 

 than in any other scansorial bird. 



15. Ring of the Blue Macaw, a bird more than twelve 



times the size of the Woodpecker, though with a 

 much smaller ring. 



