34 CLASSIFICATION OF BIRDS. 
Order TUBINARES. 
Suborder 24. TUBINARES. 
The Tubinares are the only birds which possess the following character :— 
A. External nostrils produced into tubes. 
They are also the only birds which combine the following four characters :— 
B. Nasals holorhinal. ©. Dorsal vertebre heteroceelous. D. Hallux absent or 
reduced to one phalanx, the other toes directed forwards. E. Young fed by the 
parents for some time in the nest. 
To these characters may be added the following :— 
F. Spinal feather-tract well defined on the neck. G. Oil-gland tufted. 











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The Tubinares include three families :—Diomedeidex, Puffinide, and Procellariids :— 
Diomedeidew.—Nasal tubes separated from each other ; no basipterygoid processes. 
Puffinide.—Nasal tubes side by side; basipterygoid processes present. 
Procellariide.—Nasal tubes side by side ; no basipterygoid processes. 

* | 86. Struthiones. 

