FISHES OF THE GENUS ACENTROPHOKUS. 



21 



are three or four enlarged scales in the mid-ventral line im- 

 mediately in front of the anal fin. Enlarged ridge-scales mark 

 the mid-dorsal and mid-ventral line of the tail-shaft. As they 

 near the caudal fin they become pointed postei'iorly, and pass 

 without a break into the upper and lower series of tail lulcra. 



P5 " 



The massive development of the fin fulcra is a striking charac- 

 teristic of the genus. ' In the two later species, A. varians and 

 A. alius, each fulcrum fits closely to the point over the one next 

 behind it ; in the Marl Slate species, A. glaphyrus, the points are 

 considerably more drawn out and tend to project more freely. 



