HYPOTHETICAL LIST. 327 
Famity PROCELLARIIDZ. 
5. Puffinus kuhlii (Bote). 
Cinereous Shearwater. 
Procellaria kuhlii Bork, Isis, 1835, 257- 
Pufinus kuhlii Bonar. Consp. II. 1856, 202. 
(BV arn,./C\ 506, 8 208.0) 830i) 
An Eastern Atlantic species, of which no American specimens are 
known to exist in collections. 
6. Oceanodroma hornbyi (Gray). 
Hornby’s Petrel. 
Thalassidroma hornbyi GRAY, P. Z. 8. 1853, 62. 
Oceanodroma hornbyi Bonap. Consp. II. 1856, 195. 
(BiGary. Crikga. Ri 727. C827] 
A very distinct species, of which only one specimen has been 
obtained, the alleged locality being the “ northwest coast of America.” 
Famity PHALACROCORACID&. 
7. Phalacrocorax perspicillatus Pa... 
Pallas's Cormorant. 
Phalacrocorax perspicillatus PALu. Zoog. Rosso-As. II. 1826, 305. 
PBié2n C533. bas, /Cigso.) 
Believed, on good evidence, to be now extinct, as it unquestion- 
ably is in the locality (Bering Island) where originally discovered. 
Only four specimens are known to exist in collections, —two in 
the St. Petersburgh Museum and one each in the Leyden and 
British Museums. Evenif existing, it has no valid claim to a place in 
the North American fauna. (Cf. Steyn. Pr. U.S. Nat. Mus. VI. 
1883, p. 65.) 
Famity ARDEID ZA. . 
9. Ardea wuerdemanni Barrp. 
Wurdemann’s Heron. 
Ardea wirdemanni Bairp, B. N. Am. 1858, 669. 
