168 BRITISH BIRDS, THEIR EGGS AND NESTS. 
clear oil, which, however, is by no means of an agreeable odour ; 
and probably from this cause the nest, young birds, and even the 
rock on which they are placed, stink almost intolerably. The 
nest is very slight, if any, and the bird lays her single white egg 
in little excavations, and lightly lined, on such shelves on the face 
of high precipitous rocks as are surfaced with a little grass or 
sward. ‘The egg varies in length from a little over 2} inches to 
3 inches, 
318. GREATER SHEARWATER—(Pufinus major). 
Cinerous Shearwater, Dusky Shearwater.—A bird which has 
not been very frequently recorded as met with on the British 
seas, but still one of occasional occurrence. 
319. MANX SHEARWATER—(Pufinus Angorum). 
Shearwater Petrel, Manx Puffin.—This is a regular sea-taring 
little bird, and perhaps would hardly ever care to come to land if 
it were not for the need of something solid for its eges to repose 
upon. It usually frequents islands well-washed by the sea and 
not much frequented by men. It used to be very abundant on 
the Calf of Man, but is never seen there now. In one of the 
| Scilly Islands it breeds in some numbers still, and on St. Kilda, 
the Western Isles, Orkney and Shetland. Thenest is made deep 
down in a hole in some wild and half inaccessible part of the 
islands frequented, and in it one egy of exceeding whiteness is 
laid, and remarkable for the fine texture of the shell amd the 
musky scent of the entire egg. It is about 21 inches long by 13 
broad. 
320. BULWER’S PETREL—(Tialassidroma Bulwerit). 
A Petrel of sufficiently rare occurrence. 
321. WILSON’S PETREL—(Tihalassid:oma Wilsoni). 
Equally rare with the bird last-named. 
