148 PKOCELLAEIID^. 



dots scattered over the shell, but they are so few and so small 

 that they might easily escape notice. Four examples measure 

 respectively : 1-1 by -83 ; 1-05 by -78 ; -97 by -75 ; 1-04 by -73. 



3. San Benito Island, Lower Cali- A. W. Anthony, Esq. [P.]. 



fornia, 12th July. 

 1 San Benito Island,' 25th July Sahin-Godnian Coll. 



(A. Jf. Anthony). 



Genus OCEANODROMA, BeicJienb. 

 Oceanodroma leucorrhoa ( F.). 



Procellaria leachii, T/i>en. Fortpflanz. yes. Vikj. tab. xcii. fig. 9 (1845-54) : 



Seebohm, Brit. Birds, iii. p. 443, pi. 56 (1885). 

 Thalassidroma leachii, Baedeker, Eier Etir. Tory. tab. 55. fig. 2 (1855-63). 

 Thalassidroma leucorrhoa, D/'essw, ^iVcfs Uur. xiii. p. 497 (1874) ; Di.rony 



Ibis, 1885, p. 95. 

 Cymochorea leucorrhoa, Baird, Brewer Sf Bidgw. Water Birds N. Am. 



ii. p. 407 (1884). 

 Oceanodroma leucorrhoa, Seebohm, Eqqs of Brit. Birds, p. 75, pi. 20. 



tio-. 7 (1896) ; Halvin, Cat. Birds B. M. xxv. p. 348 (1896) : Sharpe, 



Hand-l. i. p. 121 (1899). 



The eggs of the Fork-tailed, or Leach's, Petrel are either of an 

 elliptical or of a broad oval form, glossless, fairly smooth and white, 

 marked at one end with a zone of minute pinkish dots and specks. 

 They measure from 1"17 to 1-3 in length, and from "9 to -1 in 

 breadth. 



Oceanodroma castro (Harcourt). 

 (Plate XL fig. 4.) 



Thalassidroma castro, Harcourt, Sketch of 3Iadeira, pp. 123, 166 (1851) : 



id. Ann. iS- Mar/. Nat. Hist. (2) xv. p. 436 (1855). 

 Oceanodroma cryptoleucura, Salvin, Cat. Birds B. M. xxv. p. 3-jO (1896) : 



Gratd, Ibis', 1896, p. 53 ; Dresser, Birds Eur. ix. {Siipjyl.) p. 395 



(1896). 

 Oceanodroma castro. Grant, Ibis, 1898, p. 314 ; Sharpe, Hand-l. i. p. 121 



(1899). 



The eggs of Harcoiirt's Petrel closely resemble those of 0. leucor- 

 rhoa. The three examples in the Collection measure respectively ^ 

 1-3 by -94 : 1-25 by -96 ; 1-28 by -97. 



