particular attention 
should be devoted 
to the structure and 
arrangement of the 
arches supporting 
the gills. 
In the south side 
of the table-case in 
this bay is shown a 
number of dissec- 
tions, mounted in 
spirit, displaying the 
different types of 
skeletal structure 
presented by the 
fins in various 
groups of fishes. 
One of the most 
remarkable of these 
types occurs in 
Ceratodus forsteri, 
the Queensland 
Lung-fish, in which 
the skeleton of the 
fin consists of a 
central jointed rod, 
from each side of 
which diverge nar- 
rower jointed rods. 
Alongside are speci- 
mens showing 
special modifica- 
tions of certain fins, 
as in the Flying 
Fish (fig. 10) and 
Flying Gurnard 
(fig. 11), for the pur- 
pose of sustaining 
the body in the air. 
TYPES OF FISHES. 29 
