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GREBES, DIVERS, &C. 
Third Division . 
Northern grebes. Podiceps septentrionales. 
1 The great-horned grebe. Podiceps cornutus, Latham. 
2 The smaU-homcd grebe. Podiceps bicornis, Brehm. 
3 Icelandic northern grebe. Podiceps arcticns, Boje and Fabr. 
Fourth Division. 
Eared grebes. Podiceps auriti. 
1 Black-necked eared grebe. Podiceps nigricollis, Brehm. 
2 Red-necked eared grebe. Podiceps auritus, Linnaeus. 
Fifth Division. 
Dwarf grebes. Podiceps minuti. 
1 Hebridian grebe. P. hebridicus, Latham. 
2 Middle grebe. P. minor, Latham. 
3 Small grebe. P. pygmaeus, Brehm. 
Genus II. 
Diver. Colymbus. — Lath. 
First Division. 
Ice diverg. Colymbii glaciales. (Colymbus glacialis, Linn.) 
1 Iceland ice diver. C. glacialis, Linn. 
2 Great diver. C. maxiirms, Brehm. 
3 Winter diver. C. hiemalis, Brehm. 
Second Division. 
Polar divers. Colymbii arctici. (Col. arcticus, Linn.) 
1 Great polar diver. C. arcticus, Linn. 
2 Long billed polar diver. ('. nuicrorhyuchus, Brehm. 
3 Baltic diver. C. Balticus, Hornscliuch. 
Third Division. 
Red-throated divers. Colymbii rufigularos. (Colymbus et septen- 
trionalis, striatus et borealis, Linn.) 
1 Northern red-throated diver. C. septentrionalis, Linn. 
2 Northeastern red-throated diver. C. Lurame of Brunnich and Brehm- 
3 Northwestern red-throated diver. C. borealis, Bruenn. 
Second Principal Division. 
Use both feet and wings in diving. Colymbidige non solum pedum, sed 
etiam alarum ope mergentes. 
Genus I. 
Guillemot. — Lumtne. Uria Briss. 
1 Foolish guillemot. Uria troile. Lath. 
2 ? White-ringed guillemot. U. leucopsis, Brehm. 
3 Norwegian guillemot. U. Norwegica, Brehm. 
4 Brunnich's guillemot. U. Brumiichii of Sabine. 
5 Polar guillemot. U.polaris, Brehm. 
6 Brehm’s guillemot. U. unicolor, Brehm. 
