Dolphins. 39 
A near relative of the Common Dolphin, the 
Bottle-nosed Dolphin (Twrsiops twrsio) is readily 
distinguished by the reduced number of teeth (of 
which there are from 21 to 25 pairs in each jaw), the shape of the 
beak, the shorter bony union between the two branches of the 
lower jaw, and the absence of grooves in the sides of the palate. 
The geographical range of this Dolphin is very extensive, and 
examples are frequently captured off the British coasts. The 
skeleton on which the half-model exhibited is framed is that of a 
Bottle-nosed 
Dolphin. 
The Dolphin (Delphinus delphis). 
About ,; natural size. 
18 
Skull of the Dolphin. 
About } natural size. 
female captured in the Firth of Forth, and purchased in 1866. 
Two casts of the head are shown on the east wall, and skulls of 
this and other species (of which there are several) are exhibited in 
the wall-case at the south end of the building. An Indian species, 
T. abusalam, is shown in fig. 21, while the skull of the European 
one is represented in fig. 30. 
The genus to which the Dusky Dolphin (Prodel- 
phinus obscurus) belongs contains several species 
from the southern seas presenting close relation- 
ship with the Common and Bottle-nosed Dolphins. The beak is 
Dusky 
Dolphin. 
