1909. } WHALE BALENA GLACIALIS. 97 
As a rule, it blows five or six times in succession, and then 
remains under water for from ten to twenty minutes. 
It dives almost perpendicularly, and therefore in diving shows 
the whole of the flukes. It sometimes leaps high in the water, 
but it has never been seen to leap quite out of the water. 
It has never been heard to make any sound. 
Its food, both in the Hebrides and off Iceland, was found to 
be exclusively pelagic crustaceans (the “krill” of Norwegian 
whalers), a Euphausiid about half an inch long, probably 
Boreophausia imermis. 
Parasites.—All specimens were infested with thousands of 
Cyamus (the “lice” of whalers), which are especially found in 
the furrows of the excrescences along the jaws. They may also 
occur around the genitalia and scattered over the body. 
Young.—Among the numbers that have frequented the waters 
round the Hebrides during the last three years, no small young 
ones were found. The three smallest captured had total lengths 
of 31, 36, and 37 feet (9:45, 10-9, and 11:2 metres). One of 
these young ones was white-bellied, and its baleen was of a 
lighter shade of colour than that of the black-bellied. 
Propagation.—Three specimens were observed just before 
copulation on the 7th July, 1908. A female was lying on her 
back, and on each side of her lay a male with extended genital 
member, when the vessel came upon them and secured the female. 
The twelve females killed in 1907, in June and July, in the 
Hebrides, were all gravid. The feetuses were all more or less of 
the same size, having a length of from 1 to 14 metre; their 
colour was always pale blue, with no trace of white on the 
under surface. 
In the largest foetus, the first rudiments of baleen had begun 
to appear. 
In 1908, eight females were killed in the Hebrides, but, as 
previously stated, none of them was gravid. It is therefore 
possible that the gravid females go in separate schools, 
There is also an account of a foetus of about 1 metre in length 
found in the summer of 1903 off Iceland (in a female 54 feet in 
length, or about 16-4 metres). 
From the above observations the following facts appear :— 
Balena glacialis may at present be met with in the summer 
in the North Atlantic in schools of 100 or more. 
The length of most of the full-grown males captured in the 
years 1906-1908 was from 46 to 47 English feet (up to 48 feet), or 
from 14 to 14°3 metres (up to 14°6); that of the females generally 
from 47 to 48 English feet (up to 50 feet), or from 14:3 to 14°6 
metres (up to 15:2 metres). 
The greatest length was that of a gravid female, and amounted 
to 54 feet, or 16-4 metres (Iceland, 1903). 
Of the 50 specimens captured in the summer of 1906-1908 in 
the Hebrides, about 10 per cent. were white-bellied. 
Proc. Zoou. Soc.—1909, No. VII. ie 
