Length from tip of beak to tip of tail, 2 feet 10 inches.
Length of tail, 10.6 inches.
Length of beak, 4.7 inches.
Length of foot, 5 inches.
Length of wing, 3 feet.

All the three specimens of this species had a distinct although minute
claw, representing a thumb, upon one leg, thus apparently forming a link
between the genus Procellaria and the genus Diomedea.

PACHYPTILA VITTATA.

Ash-grey above; white in the under parts; quills, tail-feathers at the
tip, and band on the wings when expanded, brownish-black.

Length from tip to tip of wing, 2 feet.
Length from tip of beak to tip of tail, 10 inches.
Length from root to tip of tail, 4.3 inches.
Length of beak, 1 inch.
Length of foot, 1.5 inches.
Length of wing, 10.5 inches.

This bird is of the same species as the one I procured on the 16th of
October. I shot it about nine A.M. They are very numerous in these
latitudes; their flight resembles much that of a snipe. The name by which
they are known to the sailors is the whale-bird; they appear to take
their food upon the wing, for I have never yet seen them sit upon the
waters even for a single second, although I have observed them
frequently, and at all hours; but night and day they hurry on with the
same restless, rapid flight, sometimes going in large flocks; and I have