2 University of Michigan 



ahsenct' of large series. The f(;rmer (litters from the latter 

 chietly in having the pharyngeal teeth usually 2. 4-5. 2 instead 

 of 2, 4-4 2 and in having the barhel very small and frequently 

 absent — sometimes present on one side and not on the other. 

 Specimens of Leuciscus carlctoni also resemble closely the 

 horned dace, Scmotilus afroinaciilotKs. and this is probably 

 one reason why it has been overlooked by students of Mich- 

 igan tish. From Semotilus it may lie readil\- distinguished by 

 its more slender form, smaller mouth, finer scales on the 

 anterior part of the body, and more posterior location of th.e 

 dorsal hn. There is little chance of its being confused with 

 the other Leuciscus common in Michigan {L. ncuijacus) for 

 it is less robust in form and tends to grow larger and has a 

 better developed lateral line, at least in those already collected, 

 and in having, in man}- cases, the maxillary barbel, in the 

 last character it difi'ers from other members of the genus 

 Leuciscus, a fact that led the writer and Dr. Meek to wrongly 

 assign, it to the genus Couesius. 



The writer is indebted to Dr. Henry W. Fowler, of the 

 .\cademy of Natural Scicnc-s of Phiiadelnliia ff)r 'Iv id-n!:'"; 

 cation of the specimens. 



