32 
ORNITHOLOGY. 
Clangula albeola. Leach. 
Anas albeola. Linn., Syst. Nat. vol. 1. p. 199. sp. 18. — Wils., Am. Orn. 
vol. 8. p. 51. pi. 67. ff. 2, 3. 
Fuligula albeola. Pr. of Musignano, Sgn. p. 394. sp. 343. 
Spirit Duck, and Buffel-beaded Duck. Penn., Arct. Zool. vol. 2. p. 558,559. 
sp. 487, 489. 
Sarcelle de la Louisiane, ditte la Religieuse. Buff., PI. Enl. 948. 
This species was found at San Francisco. 
Clangula histrionica. Leach. 
Anas liistrionica. Linn., Syst. Nat. vol A. p. 204. sp. 35. — Wils., Am. Orn. 
vol. 8. p. 139. pi. 72. f. 4. 
Fuligula histrionica. Pr. of Musignano, Syn. p. 394. sp. 345. 
Harlequin Duck. Penn., Arct. Zool. vol. 2. p. 560. sp. 490. 
Le Canard ^ collier de Terre neuve. Buff, PI. Enl. 798, 799. 
F^m. ALCADJL 
Uria brevirostris. n. s.? Zool. Journ. vol. 4. p. 357. 
Uria supra griseo-fusca, capite dorsoque albo notatis ; subtus alba, fusco undulatim maculata ; rectricibus albis, duabus 
mediis fusco notatis ; rostro brevi, gracili. 
Alee supra et infra, tectricesqne inferiores fuscae. Rostrum nigrum. Pedes flavi, membranis unguibusque brunneis. 
Longitudo corporis, 9 ; rostri, ad frontem, ad rictum, 1 | ; alee, a carpo ad apicem remigis primae, 5J; caudce, 1 ; 
tarsi, J. 
I have been able to make no further observations on this bird since I first referred to it in the 
Zoological Journal. Its bill presents an interesting modification of form. 
Mergulus cirrhocephalus. n. S. 
Merg. capite supra, nucha, collo anteriori, abdominis lateribus, ptilisque nigris ; dorso, alis, caudaque plumbeo-griseis ; 
colli lateribus, pectore, abdomine, plumis subelongatis decompositis capitis cirrum longitudinalem efformantibus a vertice ad 
nucham utrinque extendentem, paucisque nuchee later um, albis. 
Rostrum pedesque albescentes, illius culmine hujusque membrana interdigitali unguibusque nigris. Tectrices alarum 
albie. Longitudo corporis, 101, ; alee, 4J; rostri, ad frontem, ad rictum. If; tarsi, 1 ; caudce, 1 1 2 . 
I have hitherto met with no description that in any respect refers to the present bird, of which 
several specimens were brought home by the expedition, all agreeing in character with each other. 
Not merely in specific characters do these birds differ from the allied birds of the family, but in those 
characters which usually serve as marks of generic distinction. In the shape of the bill they accord 
neither with Uria nor with Mergulus ; that member being much shorter and more curved than in the 
former genus, and much more compressed and more feeble than in the latter. I refer the bird, how r - 
ever, for the present to Mergulus, the preponderance of character perhaps uniting it more closely to 
that form than 1o the Guillemots ; in like manner as, on the other hand, the preceding species appears 
to incline more to these latter birds than to Mergulus. Both species form a beautiful series of con- 
necting links between the two genera. I speak, however, with great diffidence respecting all these 
water-birds. They alter so materially in the different stages of their growth, that it is difficult to 
determine their characters accurately, except by constant and lengthened observation on the spot. 
