EXPLANATION OF THE PLATES 



PLATE 4. 



Figure 1. A sclerotic ring of the Cassowary. 



la. The detached bony plate forming the ring ; being 

 one of the best examples of the manner in which 

 these bones interlock into each other. 



. Ring of the African Ostrich. 



3. Ring of the Golden Eagle, which is proportionally 



larger and the bones thicker and stronger than 

 the author has found in any other bird of this 

 family. 

 3a. Detached bones of the same. 



4. Ring of the White Tailed Eagle. 



5. A front view of the ring of the Great Horned Owl ; 



in which the bones are of considerable thickness, 



but light and porous. 

 5a. A side view of the same, shewing a more perfect 



tube than is found in any other bird. 

 5b. Three detached bones of the same. 



PLATE 5. 



Figure 1. Sclerotic ring of the Norfolk Plover; which is 

 proportionally larger than in any other known 

 instance. 



2. Ring of the Spoonbill ; very small and feeble. 



3. Ring of the Crane. 



4. Ring of the Wild Goose ; which is proportionally 



one of the smallest. 



