Bang Family arrived NYC, May 18, 1850

Looking for additional information of the following ancestors:
Peter Bang, listed as age 31 arrived aboard the vessel "Harbinger" on May 18, 1850 with his family from Germany. His wife Margareth was listed as age 30. Children: included: Anna as age 11 months and Wilhelm as age 2 months (but this may be an error, perhaps 2 years). Apparently NOT traveling with them aboard the "Harbinger" is daughter Henrietta who would have been about 6 or 7 in 1850.
The Bangs are again found in the 1860 Census, NYC. Listed is: Peter, Margart, William (age 12), Peter(age 10), born in NY, Margaret(age 6) born in NY, John(age 2) born in NY, Henrietta(age 17) born in Germany, and Anne (age 13) born in Germany.