XII 



PHYLUM CHORD ATA 



401 



and the latter in Brazil and the Guyanas. Some Teleostomi 

 are toothless, but in most instances teeth are present, and 



£ 



f!:-II 



■§1 



s s s is" s 





may be developed, not only on the pre-maxilla and maxilla 

 of the upper jaw, and the dentary of the lower, but on a 



