THE DUSKY DOLPHIN. 9 



and constant marking, as descriljed below. The distribution of these two Dolphins 

 appears to overlap, and yet, though we had many schools of each from time to time 

 around the ship, they never mingled. 



On November 14th and 15th in 11)01, when we were between 55° and 60" S. lat. in 

 135° E. 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 DOLPPIIN. 



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 1st, 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 Ijridge of brown, but 

 running otherwise from nose to tail and uniting al)ove 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 ujDon 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. 



