Is a $250 check that I received from my employer at Christmas taxable?

This money was not included in my bi-weekly bank deposit but rather on a hand-written company (dental practice) check.   I am therefore very confident that it was included my W2.  Nor have I received Form 1099-MISC.  I do not expect to receive a 1099.  TurboTax seems to direct me to report this on Form 8919 which is used to calculate uncollected social security and Medicare tax.  It also directs me to file Form SS-8 to determine employment status.  Ii am clearly an employee.  I believe the dentists intended this to be a gift.