The Egg of Thalassidroma Leachii, etc. 309 
pondent an undoubted specimen of an European Fork-tail, or 
Leach’s Petrel’s egg, which is conclusive as to the fact, that 
if there be any difference in the size of the eggs it is not in 
favor of the American. 
The specimens which I obtained from the Bay of Fundy 
measure 15; of an inch in length, and are exactly an inch in 
their greatest breadth. The specimen from Europe corresponds - 
in length, but is at least 4 of an inch larger in breadth. This 
correspondence of the eggs points to the probability of their 
identity of species, which their great powers of flight, their 
maritime life, and the proximity of their haunts, as well as 
their close resemblance, serve to confirm. 
In the same package which brought me the egg of the 
Fork-tailed Petrel, I received also the eggs of three species of 
birds, which, until the past summer, have been entirely un- 
known to naturalists. As no description of them has, to my 
knowledge, ever been given to the public either in this 
country or in Europe, I have thought a brief one might be 
interesting, especially as the birds themselves also are rare 
and but little known, and as in regard to two there has been 
much confusion. The first egg is that o 
BuLweER’s PETREL (Procellaria Bulwerit, of Jardine and 
Selby ; Thalassidroma Bulwerii, of Gould and Yarrell.) | 
This bird is included in but three or four works on Euro- 
pean ornithology, and in these only on the strength of three 
instances of accidental occurrence ; one of which was in 
England, the others were on the continent. Its true habitat : 
is the seas bounding the western shores of Africa. It is 
abundant in Madeira and the adjacent islands, from which 
the specimens sent to me were obtained. i 
hese measure 1! of an inch in length by 1; in breadth, 
They are of the purest white in color, and entirely free from 
the musky odor peculiar to the eggs of all other species of 
this genus that are known. They also differ in shape some- 
What from the eggs of their kindred species, the latter being 
