575 



Figure 8. — Comparison of tooth and myomere counts of Cayuga Lake and Seneca Lake sea lampreys. (Description 



of symbols in caption of fig. 1.) 



myomeres between the stocks is statistically sig- 

 nificant. Even though the process of making a 

 myomere count is slow, tedious, and subject to 

 error, it is one of the most useful meristic charac- 

 ters for determining specific and infraspecific cate- 

 gories of lampreys. 



Of all counts (teeth and myomeres) described in 

 the preceding paragraphs, only three characters 

 exhibited a significant difference between the 

 Cayuga Lake and Seneca Lake stocks: number of 

 cusps on the infraoral lamina; number of teeth in 

 the lateral row; and the number of myomeres. A 



