STRUHSAKER and MONCRIEF: BOTHVS THOMPSOSl 



Figure 1. — A 106.4 mm SL female Boihu.s ihonipsoni. 



Figure 2. — A 1 14.4 mm SL male Boihu.s ihompsoni. 



data indicate that B. thompsoni exhibits a more 

 variable caudal ray formula than B. pant'herinus. 



The first two and last two caudal rays of B. 

 thompsoni are usually simple. Of a sample of 

 20 specimens, only 2 ( 10% ) had either the second 

 or penultimate ray divided. 



The arrangement of gill rakers in B. thomp- 

 soni is shown in Figure 3, and counts are given 



in Table 3. There are 3-9 reduced gill rakers 

 associated with the epibranchial and 1-4 reduced 

 gill rakers associated with the hypobranchial. A 

 series of 9-14 well-developed gill rakers is 

 principally associated with the ceratobranchial. 

 The reduced gill rakers associated with the 

 epibranchial comprise the counts for the upper 

 limb of the gill arch. The first well-developed 



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