388 



SELIG HECHT 



pendicular to the sagittal plane at the widest part of the fish, 

 anterior to or dorsal to the stomach region. This place was 

 chosen for measurement to avoid any error which might arise as 

 a result of the distention by the stomach contents. The depth is 

 approximately the greatest depth. It is the distance from the 

 origin of either the anal or the dorsal fin to the other edge of 

 the fish, on a line perpendicular to the long axis of the body. 

 In Brevoortia tyrannus and both species of Anchovia the origin 



UnGTH-Cn5. 



Figure 6 



of the dorsal fin was used, whereas in the remaining species the 

 origin of the anal fin was used as the starting point. Thus no 

 artificial distinctions were made, and each part represents very 

 nearly what it signifies in ordinary usage. 



Figures 6 to 10 give the data obtained. What was said in 

 reference to the plotting of the points in the previous figures 

 (p. 381) applies here. The smoothed 'curves' passing through 

 the points are, in all cases, straight lines, indicating that the 

 relations among the various parts may be expressed by simple 



