EASTERN WHITE-HEADED PETREL. 
pouces ; — de Faile (dix pennes primaires, le premiere est la plus longue) onze pouces six 
lignes ; — de la queue (douze pennes, les deux moyennes plus longues) cinq pouces; — des 
tarses, un pouce neuf lignes ; — du doigt medius, un pouce quatre lignes. 
Par 52 degres de latitude sud et 85 degres de longitude ouest, dans la mer Pacifique. 
This does not appear to have been noticed before, and it was only by 
examination of the type-specimen as recently as 1888, that P. sericeus was 
recognised as a synonym of P. lessonii. 
In 1844 Forster’s description of his P. leucocephala was published : — 
Procellaria leucocephala F. Descr. Anim., p. 206, 1844. 
Procellaria dorso cinerea, capite subtusque Candida, remigibus fusco-nigris, pedibus 
pallidis, apice nigris. Habitat in Oceano pacifico australi a Novae Hollandiae vicinia 
usque in promontorium Hornanum, vix ultra 40° in boreau visa. Vocaverum eandem 
antea in Diaris New Holland Shearwater. Corpus circiter magnitudine Procellariae glacialis 
L. Rostrum capite brevius, validum, atrum, compressum (s. angustum), crassum 
(s. profundum), apice utraque mandibula adunca; superior sulco obliquo a naribus ad 
curvaturam apicis ; inferior sulco parallels, apice quasi infracto. Nares tubulosae, 
superae, septo tantum, separatae, truncatae, medis emarginatae. Lingua brevis, spatulata, 
margine utroque postice retrorsum serrato. Palatum triplici serie carinatum, retrorsum 
serratum. Oculi super! ; iride nigra. Pedes tridactyli, natatorii ; femora tecta ; genua 
nuda ; tibiae pallide-lividae s. coerulescenti-carneae. Digit! extrorsum et apice nigri ; 
membrana digitos connectens, ultra dimidium nigra. Membranula deeurrens utrimque ad 
digitum extimum et intimum. Ungues nigri extrorsum parum dilatati. Unguis brevis, 
niger, conicus, sessilis, loco digit! postici. 
Caput cum cervice, gula, ingulo, pectore, abdomine et crisso Candida. Linea per oculos 
nigra. Dorsum cinereum, uropygium canum. Alae fusco-nigrae. Remiges 30, prima 
brevissima, 2 longior, 3 longissima, 4-10 sensim decrescunt ; extus atrae, intus fusco-nigres- 
centes ; 11-30 breves, atrae. Tectrices ultimae et penultimae nigro-canescentes. Tectrices 
superiores concolores, in medis series pennarum fuscarum usque ad scapulares fuscas itidem. 
Rectrices 12 ; Cauda rotundata, alba, cinereo-nebulosa. 
Mensurae. 
Ab apice rostri in extremitatem caudae 
„ ,, ad extremum unguis digit! medii 
Alae expansae . . 
Rostrum longum 
„ latum ad basin . . 
„ Crassum 
Pedes cum femoribus 
Digitus medius . . 
16 unc. 
17 „ 
40 „ 
U » 
7 
1 0 35 
8 
1 0 33 
6 | „ 
f> 7 
0 35 
while the same year Gray, in his List Genera Birds, Vol. III., p. 648, included 
P. vagahunda Sol. MS. in the synonymy of P. lessonii. Herewith is attached 
Solander’s description : — 
vagabunda Procellaria supra cinerea, subtus nivea, regione Ocularum nigricante, cauda subeuneata 
albida, pedibus albicantibus, palma extus nigra 
Habitat in Oceano Antarctico, a Terra del Fuego australi, Lat. austr. LVIII : 30 (Feb. 3, 
1769) in oceano australi. Lat. austr. XXIX 10 Long. occ. CLIX 20 (Sept. 19, 
1769) Lat. austr. XXXIX : 17 Longit. occ. CCIV : 6 (Apr. 11, 1770) 
Forte varietas major Procellaria' crepidata,' Mscr 
Rostrum totum nigrum, compressum 
155 
