434 Simon Henry Gage ^ 



SEA LAMPREYS FROM LAWRENCE, MASS., IN THE SPAWNING SEASON. 



In each case the specimens were measured without selection, conse- 

 quently the various sizes are represented as in nature. All the speci- 

 mens measured had been hardened in Miiller's fluid and alcohol, except 

 a few of the lake lampreys out of the spawning season. Part of those 

 were hardened in picric-alcohol and alcohol. Only nine of each sex of 

 the non-spawning ones were in the collection, consequentlj' onl}' nine 

 could be measured. lu all the other cases ten were measured. The 

 sexes of the just transformed and the larval lampreys were not separated. 



An examination of the table for the lake lampreys in the 

 spawning season will show that the relative proportions of the 

 male and the female shown in the frontispiece of this article 



