74 CLASS II. ORDER VI, 



ALGA, (awk,) bill toothless, short, compressed, 

 convex, often transversely furrowed ; lower mandi- 

 bles gibbose near the base ; nostrils linear ; legs 

 mostly three-toed. 



APTEXODYTA, (penguin,) bill straight, a little 

 compressed and sharp-edged, upper mandible Ion 

 gitudinally, obliquely grooved, the lower truncate 

 at the tip ; tongue with reflected prickles ; wings 

 fin-form, without quill-feathers ; feet fettered,, 

 four-toed. 



Section B. Long-ivinged flying sea birds. 



Jti,t>+*Sfo 



PROCELLARIA, (petrel,) bill toothless/ a littre 

 compressed, hooked at the point ; mandibles equal ; 

 nostrils cylindrical, tubular, truncate, lying on the 

 base of the bill ; feet palmate ; the back toe point- 

 Ing downwards, sessile, sharp, a mere spur. 



DIOMEDEA, (albatross, man-o-war bird,) bill 

 straight, upper mandible hooked at the point, low- 

 er truncate ; nostrils oval, wide, prominent, late- 

 ral : tongue very small ; feet four-toed, all placed 

 forward. 



LARUS, (gull, sea-mew,) bill straight, sharp- 

 edged, a little hooked at the tip, and without teeth ; 

 lower mandible gibbose below the point ; nostrils 

 linear, broader on the fore part, and placed in the 

 middle of the bill. 



STERNA, (tern, noddy,) bill subulate, straightish, 

 pointed, a little compressed, without teeth ; nos- 

 trils linear ; tongue pointed ; wings very long ; 

 tail mostly forked. 



RUYNCHOPS, (skimmer,) bill straight ; the up- 

 per mandibles much shorter ; the lower truncate 

 at the tip. 



