NATATORES. 467 



Its single white egg is two inches and three-quarters long 

 by one and three-quarters wide. 



All the upper surface dark chocolate -brown, which gra- 

 dually deepens into black on the primaries and tail ; feathers 

 of the scapularies, which are very broad in form, washed with 

 lighter brown at their tips ; face and throat dark brownish 

 grey, the remainder of the under surface greyish brown ; bill 

 reddish fleshy brown, darker on the culmen and tip ; legs and 

 feet yellowish flesh-colour. 



Total length 15j inches ; bill If ; wing 11 Jj tail 6; tarsi 1 J; 

 middle toe and nail 2f . 



Genus THALASSOICA, Reichenhach. 



The delicately coloured Petrel, for which the above generic 

 name has been proposed, differs from all its congeners, and I 

 therefore concur in the propriety of its separation. It is nearly 

 allied to Fulmarus. 



Sp. 639. THALASSOICA GLACIALOIDES. 



SlLVEUY-GREY PeTREL. 



Procellaria glacialo'ides, Smith, Zool. of South Africa, Aves, pi. 51. 

 Thalassoica glacialoides, Reich. Syst. Av., tab. xxi. fig. 789, et tab. 25. 

 figs. 2608, 2609. 



Procellaria glacialoides, Gould, Birds of Australia, fol., voL vii. 

 pi. 48. 



During my passage to and from Australia I saw numerous 

 examples of this bird, both in the Atlantic and Pacific. I 

 first met with it off" the Cape of Good Hope, and it was fre- 

 quently seen from thence across the South Indian Ocean to 

 New South Wales ; I subsequently observed it between Syd- 

 ney and Cape Horn ; it was numerous off" the Falkland Islands, 

 and I have a specimen killed on the shores of New Zea- 

 land. One of the finest examples I possess was captured 



3 H 2 



