Conrath et al.: Age and growth of Mustelus cams 



677 



6 7 8 



Vertebral radius (mm) 



10 



12 



Figure 4 



Relationship between vertebral radius (VR) and total length (TL) for Mustelus canis. 



readable. To test for precision, a second reader read verte- 

 brae from a total of 185 animals (twenty from each 10-cm 

 size group, except for the 33-42 cm size group |«=9|) and 

 four vertebrae were found to be unreadable. A contingency 



table of reader one's versus reader two's ages was made 

 and a chi-square test resulted in a ;|f ^ = 3. 19, which was less 

 than the critical value of x'nor,.i = 3.84; thus the hypothesis 

 of symmetry was not rejected (Table 1). The overall percent 



