cxl INTRODUCTION. 
Genus Thalassidroma. 
A genus in which Vigors and others have placed the smaller memhers of the ProcellaridcB, the Storm-Petrels. 
In tlie British seas we have two breeding species, and a third looks in upon us now and then when it has 
crossed the Atlantic to our side of the globe. 
407. Thalassidroma Leachii .......... Vol. V. PI. LXXXV. 
Forked-tailed Storm-Petrel. 
Breeds in the Outer Hebrides, and frequently found dead on inland properties, apparently from exhaustion, 
from the exertion of crossing overland from sea to sea. 
408. Thalassidroma pelagica ......... Vol. V. PI. LXXXVI. 
Storm-Petrel. 
This little sprite of the waters is known to breed on many parts of our western coasts from the Scilly Isles 
to the Orkneys, and on some of the rocky islets of the west coast of Scotland. 
409. Thalassidroma Bulweri. 
Bulwer’s Petrel. 
This bird, which inhabits Madeira, sometimes visits our seas, and by Yarrell and others has been included 
in our avifauna. 
