al vertebrae united; bodies of the
lumbar vertebrae distinguished from those of the preceding genera by
being more elongated, the length being to the width as 3 to 2.
Flippers of moderate size, narrow and pointed. Dorsal fin situated
near the middle of the back, of moderate size, and sickle-shaped. Head
in front of the blow-hole high, and compressed anteriorly, the snout
truncated. See CA'ING WHALE.

Risso's dolphin, _Grampus griseus_, represents another genus,
characterized by the absence of teeth in the upper and the small
number of these in the lower jaw (3 to 7 on each side, and confined to
the region of the symphysis). Vertebrae: C 7, D 12, L 19, Ca 30; total
68. General external characters much as in _Globicephalus_, but the
fore part of the head less rounded, and the flippers less elongated.
_G. griseus_ is about 13 ft. long, and remarkable for its great
variability of colour. It has been found, though rarely, in the North
Atlantic and Mediterranean.

The common dolphin (_Delphinus delphis_) is the typical representative
of a large group of relatively small species, some of which are wholly
marine, while others are more or less completely fluviatile. They are
divided into a number of genera, such as _Prodelphinus_, _Steno_,
_Lagenorhynchus_, _Cephalorhynchus_, _Tursiops_, &c., best
distinguished from one another by the number and size of the teeth,
the form and relations of the bones on the hinder part of the palate,
the length of the beak and of the union of the two halves of the lower
jaw, and the number of vertebrae. For the distinctive characters of
these genera the reader may refer to one of the works mentioned below;
and it must suffice to state that, collectively, all these dolphins
are characterized by the following features. The teeth are numerous in
both jaws, and more than 20/20 in number, occupying nearly the whole
length of the rostrum, and small, close-set, conical, pointed and
slightly curved. Rostrum more or less elongated, and pointed in front,
usually considerably longer than the cranial portion of the skull.
Vertebrae: C 7, D 12-14, L and Ca variable; total 51 to 90. Flippers
of moderate size, narrow, pointed, somewhat sickle-shaped, with the
first digit rudimentary, the second longest, third nearly equal, and
the fourth and fifth extremely short. Externally the head shows a
distinct beak or pointed snout, marked off from