PALMIPEDES. 263 



External margins of the bill entire. 

 With a hind claw. 



220. Procellaria. Petrel. Nostrils united into a sin- 

 gle tubular opening on the upper part of the bill. Lower 

 mandible truncated. P. giaclalis and pelagka. 



221. PuFFiNUs. Puffin. Nostrils ojjening separately. 

 Lower mandible bent downwards. Procellaria Puffinus. 



Without a hind claw. 



222. Halodroma. Nostrils situate dorsally. Lower 

 mandible with a gular pouch. Procellaria urinatrix. 



223. DiOMEDEA. Albatross. Nostrils lateral. Bill 

 strong, sharp. D. exiilaiis. 



Apertures of the nostrils simple. 



Bill hooked at the end. 



224. Cataractes. Skua. Nostrils covered with a 

 corneous plate, reaching to the base of the bill. Lams Ca- 

 taractes and parasitictis. The L. crepidatus is merely the 

 young of L. parasiticus. 



225. Larus. Gull. Nostrils simply covered by a con- 

 tinuation of the bill. L. marinus. 



Bill not hooked at the end. 



226. Sterna. Tern. Bill compressed, slender, pointed. 

 Tail forked. T. hirundo. 



227. Rynchops. Bill depressed, truncate. Upper man- 

 dible shorter than the lower. R. nigra. 



Birds, like quadrupeds, are usually preserved in a mu- 

 seum in a dried state, or stufPed. The directions already 

 given for the preservation of quadrupeds, are sufficient to 

 guide any one in accomplishing the same object with birds. 

 There are, however, a few peculiarities in the mode of 

 preserving birds, which it may be worth while briefly to 

 notice. 



