GENERAL INDEX. 
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GENUS RHYNCHOPS. 
Bill long, compressed like the blade of a knife, low- 
er mandible truncate, and much longer than the upper ; 
nostrils large, oblong, pervious, marginal, placed near 
the base ; feet weak, webs deeply scalloped, hind toe ar- 
ticulated on the tarsus, and very small ; wings very long. 
Black Skimmer or Shearwater, (i?. nigra) - vii 89 
GENUS STERNA. 
Bill subulate, straightish, compressed, strong, man- 
dibles of equal length ; nostrils oblong, pervious ; feet 
slender, tarsus short, webs scalloped ; hind toe free and 
weak ; wings long, acuminated. 
Great Tern, (S. hirundo) - - - vii 80 
Lesser T. (S', niinuta) ... vii 84 
Marsh T, (S. aranea) - . . . yiii 158 
Short-tailed T, (S. plumbea) - - vii 87 
Sooty T. {S. fuliginosa) - - - viii 161 
GENUS LARUS. 
Bill of middling length, strong, hard, compressed, 
sharp-edged, bent downwards at the tip, lower mandible 
gibbous below the point j nostrils lateral, pervious, in 
the middle of the bill ; tarsus pretty long ; hind toe free, 
short, articulated high up on the tarsus. 
Laughing Gull, (L. atricilla) - - ix 257 
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VOL. IX. 
