




GALLIFORMES. ei 
Suborder 26. GAVIA. 
The Gulls and their allies may be diagnosed as follows :— 
A. Palate schizognathous. B. Dorsal vertebre more or less opisthoccelous. ©. Basi- 
pterygoid processes absent. D. Spinal feather-tract forked on the upper back. 
E. Young born covered with down, and able to run in a few hours. 









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The Gavi include the Alcidx, the Laride, the Cursoriide (Oursorius, Thinocorus, Attagis, 
Chionis, Dromas, and Glareola), and the (idicnemide (@dicnemus and Pluvianus). 
The Gidicnemide are holorhinal; the other families are schizorhinal. The Alcide have 
lateral occipital fontanelles ; the Cursoriide, like the (Edicnemide, are not web-footed, and 
doubtless possess other good characters to distinguish them from the Laride. 
+ Character B excludes all the families in suborder 15, except the Steatornithidx, which are excluded by 
character A, so that the diagnosis is complete without character EB. 
