286 



U.S. NATIONAL MUSEUM BULLETIN 2 82 



TABLE l6.--Comparison of the hybrid (VMMZ 137904), Noturus exilis X 

 Noturus miurus, from the Poteau River, Oklahoma, with three species 

 of Noturus 

 [The data are from eastern Oklahoma specimens as follows: Noturus miurus, 

 counts from 12, Poteau River, UMMZ 137902 and measurements from 11, Illi- 

 nois and Poteau Rivers, UMMZ 137864 and 137902; Noturus exilis, measure- 

 ments from 20 and counts from 32, Illinois River, UMMZ 137863; Noturus noc- 

 turnus, counts and measurements from 12, Poteau River, UMMZ 137903. Ranges 

 of variation are followed by means in parentheses. Proportional measurements 

 are stepped. Data from both elements of paired structures are included.] 



