PISCES. 39 



cious. The bowfin of the United States is the most like 

 Teleosts of all. 



FIG 17. Garpike (Lepidosteus osseus). After Tenney. 



SUBCLASS IV. TELEOSTS (p. 24). 

 SUBCLASS V. DIPNOI (Lung-fishes). 



Three or four species, one from Australia, one from 

 Africa, and one or two from South America, are the sole 

 living representatives of this group, which however occurs 



Fro. 18.- Lung-fish (Protopterus annectens). After Boas. 



as fossils in very old rocks. They have scaly bodies, 

 diphycercal tail, spiral valve, and a swim-bladder which is 

 used as a lung. Both pectoral and ventral fins are present, 

 and these are supported by a peculiar skeleton, while the 

 skull shows many strange features. 



