ntioned, and by _B. musculus_ and _B.
borealis_, all inhabitants of British seas, but the question whether
almost identical forms found in the Indian, Southern and Pacific
Oceans are to be regarded as specifically identical or as distinct
awaits future researches, although some of these have already received
distinct names. See RORQUAL.

In the report on the zoology of the "Discovery" expedition, published
in 1907 by the British Museum, E.A. Wilson describes a whale
frequenting the fringe of the Antarctic ice which indicates a new
generic type. Mainly black in colour, these whales measure about 20 or
30 ft. in length, and have a tall dorsal fin like that of a killer.

_Toothed Whales._--The second suborder is represented by the toothed
whales, or Odontoceti, in which there is no whalebone, and teeth,
generally numerous, though sometimes reduced to a single pair, and
occasionally wanting, are normally developed. Unlike that of the
whalebone-whales, the upper surface of the skull is more or less
unsymmetrical. The nasal bones are in the form of nodules or flattened
plates, applied closely to the frontals, and not forming any part of
the roof to the nasal passage, which is directed upwards and
backwards. The olfactory organ is rudimentary or absent. Hinder end of
the maxilla expanded and covering the greater part of the orbital
plate of the frontal bone. Lacrymal bone either inseparable from the
jugal, or, if distinct, large, and forming part of the roof of the
orbit. Tympanic bone not welded with the periotic, which is usually
only attached to the rest of the skull by ligament. Two halves of the
lower jaw nearly straight, expanded in height posteriorly, with a wide
funnel-shaped aperture to the dental canal, and coming in contact in
front by a flat surface of variable length, but constituting a
symphysis. Several of the anterior ribs with well-developed capitular
processes, which articulate with the bodies of the vertebrae. Sternum
almost always composed of several pieces, placed one behind the other,
with which several pairs of ribs are connected by well-developed
cartilaginous or ossified sternal ribs. External respiratory aperture
single, the two nostrils uniting before they reach the surface,
usually in the form of a transverse sub-crescentic valvular aperture,
situated on the top of the head. Flippers with five digits, though the
first and fifth