740 



THE AMERICAN NATURALIST 



[Vol. XLVI 



resp. Zool. Soc. London, Part I, pp. 133-134. 



Examined specimens of P. fluviatilis weekly from March to 

 niddle of May. Up to April 19, there were more females than 

 nales; thereafter males outnumbered females, two to one. 

 Specimens taken April 26, appeared ready to spawn. By May 



narinus were taken in the Severn on May 3— " about which time 



ixtT., and Cole, Leon J. P P p g 



On the nesting habits of the brook lamprey (Lampetra wilderi). 

 Amer. Naturalist, XXXIV, pp. 617-620. 



luron Elver near Ann Arbor, Michigan. Males precede females 

 a beginning the nest. Nests are 7i inches in diameter and 



aphy (pp. 74, 89-91) 



