158 Cockerell and Allison. — The Scales of American Ci/prinidse. 



large, with few radii, and the basal margin is strongly undu- 

 lated ; a scale extraordinarily like that of the American Catos- 

 tonjid Carpioides velifer. Barbus bynniForsk. has a veiy different 



Fig. 1. Salmo stomids. 

 Showing absence of radii. 



Fij?. '_'. Catosttuniifi (jriseiii!. 

 Show ing l)a.sal and apical radii. 



l*"ig. :;. yolropiK cornutus. 

 .■^liowinf,' i-;ulii in aiiical licld only 



scale, with numerous apical radii. In these Old World fishes 

 the circuli are very numerous and regular, whereas in many 

 American forms they become fewer and variously modified. In 

 Leuciscus the apical circuli (i. e. all apical of the nuclear area) 



