449 
87. Phaleris. Bill very short, curved, sub-quadrangu- 
lar : nostrils pervious, half closed by a naked mem- 
brane. 
88. Cerorhinca. Bill curved, compressed, longer than 
high, surmounted at base by a long obtuse process : 
nostrils pervious, not feathered. 
89. Mormon. Bill curved, exceedingly compressed, high- 
er than long : nostrils half closed by a naked mem- 
brane. 
90. Alca. Bill curved, exceedingly compressed : nostrils 
half closed by a feathered membrane. 
Note 27. Thalassidroma. We shall here add the specific 
phrases of the two other species of this genus with which we are 
acquainted, and which we have ourselves distinguished from those 
in the text. 
3. Thalassidroma pelagica , Vigors. Sooty-black ; upper tail- 
coverts white with black tips ; tail even, the wings reaching a little 
beyond it ; tube of the nostrils straightish ; tarsus seven-eighths of 
an inch long. 
Procellaria pelagica , Temm. Nob. Jour. Ac. Phil. iv. p. 227. 
pi viii.. 
Inhabits the coasts of Europe, principally those of Great Britain 
and its northern isles : found also in the Mediterranean. 
4. Thalassidroma oceanica , Nob. Brownish-black ; upper tail- 
coverts wholly white ; tail slightly emarginate, the wings reaching 
more than an inch beyond it ; tube of the nostrils recurved ; tarsus 
nearly one inch and three quarters long. 
Stormy petrel. Lath. Synop. Le Petrel ou oiseau tempete , Buff, 
pi. enl. 993. Procellaria oceanica , Nob. Zool. Jour. Lond. iv. p. 7. 
Inhabits the South Seas : common near the Cape of Good Hope, 
and the island of Tristan d’Acunha. 
In the Turin Museum, superintended by the learned Bonelli, I 
had the good fortune to find a second specimen of this interesting 
species, which was obtained near the island Tristan da Acunha. 
The following observations were made at the time. 
f 9 K 
V fU w 
