TYPES OF FISHES. 



29 



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 ta 

 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 G-urnard 

 (fig. 11), for the pur- 

 pose of sustaining 

 the body in the air. 



