Gunder Olson, the 4th child born to Sigri Gunnersdatter and Ole Larson was the second child to leave Norway and move to the United States.
There does not appear to be an emigration document in the Odda parish records from Hordaland County, Norway, for Gunder, but I was able to locate the transcribed emigration records from Bergen, Norway.
Gunder is listed at number 6074 (spelled Gunner) and left Bergen on May 3, 1880. The word "ugifte' translates to "unmarried".
Gunder traveled on the ship, Circassian on the Allan Line. (More information can be found by clicking on the respective links).
Below is the passenger list; Gunder is listed toward the bottom second above the black line. If you look to the far right column, you will note the destination is listed as Lee, Illinois.
The ship Circassian sailed from Liverpool, England on May 7, 1880, arriving in Quebec, Canada on May 19, 1880.