THE DUSKY DOLPHIN. 9 
and : : 
ene marking, as described below. The distribution of these two Dolphins 
appears vi m | | 
pp : to o erlap, and yet, though we had many schools of each from time to time 
around the ship, they never mingled 
5 : 
a November 14th and 15th in 1901, when we were between 55° and 60° &. lat. in 
al ; long., we had Dusky Dolphins round us, and were at the same time just 
outside the ice pack. But a few days later we lost them, and were joined by the 
other species, which we at once called the Hour-glass Dolphin from the peculiar 
and characteristic arrangement of its colouring. In this it somewhat resembles that of 
the Dusky Dolphin, yet is quite easily to be distinguished from it. 
AN UNDESCRIBED DOLPHIN. 
This new Dolphin is to be met in abundance in the outer zone of the Antarctic 
pack ice. We saw it on November 19th in about the same latitude in which we 
had seen Lagenorhynchus obscurus four days before, but farther to the east. We 
again saw numbers playing round the ship on December 29th, 30th and 31st, and on 
January Ist, the day before we actually sighted ice on our way to the South in 1902. 
Also in 1904, as we made our way to the North, on March 5th and 6th we had 
large schools of this same Dolphin round the bows of our ship, moving easily with us, 
though we were running at from 8 to 10 knots an hour. They are from 8 to 10 feet 
long, and strikingly marked with white and brown. The whole of the back, head, 
dorsal fin and tail is rich dark brown, as are also the under parts; but there are on 
each side of the body two extensive patches of white which are separated from one 
another just below the dorsal fin by an isthmus of the brown which runs obliquely 
down and forwards, uniting the brown of the upper parts with the brown of the lower 
parts. In other words, the animal may be described as uniformly dark brown all over 
save for a broad white lateral band broken in the centre by a bridge of brown, but 
running otherwise from nose to tail and uniting above the tail. The dorsal fin, which 
is dark brown, is large in proportion to the size of the animal, and in most cases is 
falciform, often markedly crooked, almost to a right angle (fig. 7). 
Attempts were made with the harpoon to obtain an example of this Dolphin, 
but without success, and it remains for others to give a more detailed description than 
is possible at present from observations made only upon animals in active motion. 
This short and very insufficient account of the Whales and Dolphins observed 
during our cruise in Antarctic waters, though it throws little light upon their 
habits, may nevertheless be of use to some future observer. It is only with the object 
of pointing out that there are new and unknown species, apparently peculiar to the 
region, that I have thought it worth while to record our scanty observations. An 
expedition properly equipped for the capture and study of such animals would assuredly 
reap a harvest in the South. 
