ornithologist's text-book. 3*21 



VII Order, Natatores. 



XXXVI Fam. Longipennes. — Rhyncops, Sterna, 

 Larus, Lestris. 



XXXVII Fam. Tubinares. — Procellaria, Ha- 

 ladroma, Pachyptila, Diomedea. 



XXXVIII Fam. Lamelloso-dentati. — Anas, An- 

 ser, Mergns. 



XXXIX Fam. Steganopodes. — Pelecanus, Ha- 

 lieus, Dysporus, Phaeton, P lotus. 



XL Fam. Pygopodes. — Colymbus, Eudytes, 

 Uria, Mormon, Alca. 



XLI Fam. Impennes. — Aptenodytes, 

 7 orders, 41 families, 155 genera. 



