Translation 2783

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174
considerably; its height rarely exceeds 30-35 cm-. Yhe-flukes . are
large, •their spread being from one-quarter to one-third of the body
length
The head occu 2 ies more than one-quarter (but .not more than
one-third) of the length of the body.- It is re latively flattened
in shape. -Besides a medial crest, which runs along - the centre of the
head from the tip of the snout to the blow-hole; there are two more
• ows of tubercles along the margins of the head,'each tubercle being
about the size of a haIf-orange; from five to eight similar tubercles
are located on the crest itself.
re
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Pitc. 46. 1701)6aTI:Iii
Fig. 46. Hump-back whale.
-The filtering apparatus consists of 2.70-400 relanvely-short
brownish-black baleen plates with a greyish-brown fringe. The largest
plates are in the posterior third of the rows, and attain a
length of 85 cm in whales of the northern hemisphere and 107 cm in
whales of the southern hemisphere. White plates sometimes occupy
. almost one-;third of a row in its front part.
The lower jaw is massive- and convex. !hen the mouth is closed
it projects rôr 20 - or 30 cm beyond the tip of the snout. - .Along the
edges of the snout there is a ràw of tubercles, each . as large as a
half-lemon or half-orange. In tue region of the symphysis (tinion of
the halves of the lower jaw) there is a large projection and a Tow
of - small tubercles. Therc are several rows of small hairs on both
the upper and the lower jaws.
There are from 11-15 to 35-36 or even more folds on the v en
tral - side .of the body. YhOy are considerably lar G er çup to 150 Mm
vide and 60-70 mm deep) than those on oLncr rorquals, but they do
not reach tue wabilicus.
Inliko other inru whales, hump-bacb whales are not of uniform