VERTEBRATE PALEONTOLOGY IN 191 1 583 



fresh material have shown that some of these are synonymous ; 

 on the other hand, a few new species have been added to the 

 list, with the result that the present number is still twenty-two, 

 although these represent fourteen generic types. After a 

 systematic survey of the species, Mr. Hussakof contrasts the 

 fishes of the American with those of the Bohemian Permian ; 

 this comparison of the faunas of these areas reveals the fact 

 that ''while the groups represented in the two are, with the 

 exception of the Acanthodii, the same, there is a marked differ- 

 ence in the genera respectively represented, thus proving the 

 long segregation of the two stocks from which the Permian 

 faunas of the two localities are descended. The most remark- 

 able difference between the faunas is the presence of Acanthodii 

 (three genera) in Bohemia and their absence in Texas. The 

 Acanthodii occur in Bohemia at the same level as Pleuracanthus, 

 a horizon which may be correlated approximately with the 

 Texas and Illinois horizons." 



