EXPLANATION OF PLATE XX. 
Fig. 1. Larus pacificus, Latham. 
Pacific Gull. 
Fig. 2. II.KJrATOPUs unicobor, Wagler. 
Sooty Oyster-catcher. 
Fig. 3. Sylochelidon CASPIA, Pallas. 
Caspian Tern. 
Fig. 4. Xema nov^:-hollandia), Stephen. 
Jameson’s Gull. 
