Translation 2783

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with a distinct.concavity in the rear. The flippers are slender,
and are from one-tenth:to one-eighth of the body length;.the spread
• of the flukes is 21>.-24.», of the body length. There are from eight
to eleven pairs of teeth in the upper jaw and •frceeight to twelve
pairs in the lower jaw. The teeth are large, being:Up to 25-27 mm
in diameter.
There are 50 irrtebrae.(rarely 51), and ten pairs of ribs.
l'aise killer whales are distributed ir the same regions as
common blackfish, but they do not range so far north. in the Porth
Atlantic they have been observed in Davis strait.
Genus Stenella Gray, 1964
Whe largest specimens of stenella attain a length of 2. .5
metres and a weight of about 150-160 kg.
The body has a stream-lined shape, and externally greatly
resembles the body of the common dolphin csee rig. 61). Lach jaw
has from 30 to 57 pairs of small teeth, up to 3.3 mm in diameter.
The palate is smooth, without longitudinal grooves. This feature
brings. senella close to the harbour porpoise. Thus stenella occupies,
as it were, a position intermediate between the common dolphin
and the harbour porpoise.
The body is grey or dark-grey, with light-grey patches
all over it.
The genus is considered to contain from five - or six up to
ten species, but ail of them have been only ?lightly studied. Most
of them are dwellers.in warm or temperate waters.
Striped Dolphin U3tenella coeruleoalbus hoyen, 1083)
The back, flippers, dorsal •fin, ncI fluk,s are sky-blue; the
_•ventral surfaoe of ti.e bociy and the sides are white. A sin&le narrow .
• 75.
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