BROWN-HEADED PETREL. 
■was still uncertainty, Salvin refused to displace 0. arminjoniana by P. alha 
GmeUn. 
I have seen no argument against this identification, but in the Monograph 
of the Petrels, p. 226, 1 find the White-breasted Petrel and Norfolk Island Petrel 
of Latham placed with doubt in the synonymy of 0. neglecta Schlegel, along 
with P. phillipii Gray, and though the latter name had priority it was not used, 
yet for the Kermadec Island Petrel the vernacular of Phillips’s Fulmar was 
deliberately utilised. 
Herein is shown the reason for the introduction of the White-breasted 
Petrel in connection with the Norfolk Island Petrel. It is tolerably certain that 
Latham drew up the description of the latter species in Phillips’s Voyage, and 
therein it is compared with Latham’s White-breasted Petrel. 
Accordingly, in his Index Ornith., Vol. II., p. 822, 1790, when he accepted 
Gmelin’s P. alba for his White-breasted Petrel, he added as var. a Latin 
translation of the description of the Norfolk Island Petrel. 
Although the description of the White-breasted Petrel agrees somewhat 
with 0. arminfoniana, I do not think it was based on that bird. And now the 
detailed description made by Solander, which I herewith reproduce, proves that 
P. sandaliata is also not applicable to that, but is a beautifully accurate one of 
the bird afterwards described by Schlegel as P. incerta : — 
sandaliata Procellaria corpore supra fusco-nigricante subtus albo, coUo cinereo, cauda rotundata 
utrinque nigricante, pedibus albidis, palma antice nigra 
Fig. Picta. 
Habitat in oceano America' australis, Latit. austr. gr. XXXVII (Dec. 22, 1768) 
Mother Carey’s Hen 
Caput & Gollum undique cinerea 
Dorsum e fusco-nigricans, ut 
Ala' qua' subtus pallidiores 
Pectus, Abdomen & Venter alba 
Crissus cinereus 
Cauda brevis, rotundata, nigricans 
Rostrum nigrum 
Mandibula superior in medio depressa, apice adunca, a basi ad sinum utrinque sulco 
exarata 
Tubus narium brevis, vix tertiam partem rostri adtingens, superne convexus intus 
bilocularis, seu quasi e duobus cylindris compositus, quodtamen extus nonadparet 
Pedes albidi 
Membrana conectens antice nigra 
Ungues omnes nigri, obliqui ; posticus brevis sessilis 
Pondus 20 
Longitude ab apice rostri ad finem cauda' 171 
inter apices alarum expans 3 ped 6 
rostri 
cauda 
Remigis longissima' 12| 
unc. 
151 
