It may be distinguished when flying by its rounded wings and its habit of progressing with wings held motionless close over the surface of the water. The crown, nape, and upper parts are sooty black, under parts white, except for a patch of sooty brown behind the thighs; legs and feet flesh-coloured; outer toes black. Length 15 in.; wing 9·5 in. THE LITTLE DUSKY SHEARWATER Puffinus assimilis, Gould This is another species inhabiting the Salvages and islands off the west coast of Africa. Some three or four examples have been obtained, which were originally wrongly identified as _P. obscurus_, an American species. The upper parts are slaty black and under parts white. Bill and legs blackish; webs yellow. Length 10·5 in.; wing 7·4 in. THE CAPPED PETREL Æstrelata hæsitata (Kuhl) Extremely little is known of this species, which used to nest in the West Indies. It has occurred here on one occasion only. The crown, nape, and mantle are dark brown; hind-neck and upper tail coverts white; cheeks grey; forehead and under parts white; central tail feathers brownish black; the rest, white edged with brown. Length 16 in.; wing 11·3 in. THE COLLARED PETREL Æstrelata brevipes (Peale) A single example of this Petrel was obtained off the coast of Wales in December 1889. The southern and western Pacific appear to be its true home. The crown is slaty grey; rest of upper parts darker, becoming browner on the wing coverts. Forehead and throat white; rest of under parts white, sometimes tinged with grey. Length 11·5 in.; wing 8·7 in. BULWER’S PETREL Bulweria bulweri (Jardine and Selby) This small Petrel is a common resident in the Canaries and neighbouring islands, but only one individual has straggled to our shores. The plumage is of a uniform sooty brown; tail wedge-shaped. Bill black. Legs reddish brown. Length 11 in.; wing 8 in. THE FULMAR Fulmarus glacialis (Linnæus) Although not very rare, this bird is seldom seen, as it spends most of its time at sea in attendance on the fishing-boats or on the banks where the fish abound. In Scotland it nests on St. Kilda and a few of the other islands of that group; while in the Shetlands, where it was first known to nest in 1878, it has now spread to several of the neighbouring stacks. The nest is placed on a ledge on the face of a precipitous cliff, and the single egg is pure white with a few reddish-brown spots. The young are at first nourished on a yellowish oil vomited by the parent birds, and large numbers are annually taken in St. Kilda for the sake of this oil. It may easily be distinguished from a Gull on the wing by its peculiar flight and rounded wings.