246 



FISHES 



Teleosteans, on the other hand, the anus, generative opening, 

 and renal opening are separate on the ventral surface in the 

 order mentioned. 



In accordance with the various degrees of structural differ- 

 ence, some of the most important of which have been men- 

 tioned in the above general survey, the class of fishes can be 

 divided and subdivided in a systematic classification, as shown 

 in the following table : — 



